The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A001013 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A001013

Jordan-Polya numbers: products of factorial numbers A000142.
(history; published version)

#100 by Peter Luschny at Thu Dec 30 00:34:16 EST 2021

STATUS

proposed

approved

#99 by Andrew Howroyd at Wed Dec 29 20:41:02 EST 2021

STATUS

editing

proposed

#98 by Andrew Howroyd at Wed Dec 29 20:37:45 EST 2021

COMMENTS

Possible numbers of transitive orientations of comparability graphs (Golumbic, 1977) - David Eppstein, Dec 29 2021

Possible numbers of transitive orientations of comparability graphs (Golumbic, 1977). - David Eppstein, Dec 29 2021

STATUS

proposed

editing

Discussion

Wed Dec 29

20:41

Andrew Howroyd: Not everyone is able to accurately make such deductions. It is better that additions to the comments section are signed to avoid confusion.

#97 by David Eppstein at Wed Dec 29 20:36:14 EST 2021

STATUS

editing

proposed

#96 by David Eppstein at Wed Dec 29 20:35:21 EST 2021

COMMENTS

Possible numbers of transitive orientations of comparability graphs (Golumbic, 1977) - _David Eppstein_, Dec 29 2021

STATUS

proposed

editing

Discussion

Wed Dec 29

20:36

David Eppstein: I thought that since the reference made it clearly not an original contribution by me, it didn't need a signature. But ok, signed.

#95 by David Eppstein at Wed Dec 29 20:05:41 EST 2021

STATUS

editing

proposed

Discussion

Wed Dec 29

20:10

Andrew Howroyd: You have forgotten to sign your new comment.

#94 by David Eppstein at Wed Dec 29 20:05:15 EST 2021

COMMENTS

Possible numbers of transitive orientations of comparability graphs (Golumbic, 1977)

LINKS

Martin Charles Golumbic, <a href="https://doi.org/10.1016/0095-8956(77)90049-1">Comparability graphs and a new matroid</a>, Journal of Combinatorial Theory, Series B, Vol. 22, No. 1 (1977), pp. 68-90.

STATUS

approved

editing

#93 by N. J. A. Sloane at Tue Dec 28 17:22:45 EST 2021

COMMENTS

A000079, A000400 and A009968 are all subsequences. - Bill McEachen, Nov 18 2021

CROSSREFS

Cf. A000079, A000400, A009968. - Bill McEachen, Nov 22 2021

STATUS

proposed

approved

#92 by Bill McEachen at Tue Nov 23 09:13:59 EST 2021

STATUS

editing

proposed

Discussion

Tue Nov 23

09:37

Joerg Arndt: Well, (n!)^k is a term for n >= 1 and k >=1.  More generally a(n)^k is a term for all n and k >= 1. Still more generally, a(k)*a(j) is a term for all k and j, so not sure the comment really adds anything of substance.

Thu Dec 23

03:42

David Eppstein: These edits have been open for a month. Can they somehow be resolved? They are getting in the way of a more substantive edit that I want to make to this sequence: these numbers are the numbers of transitive orientations of comparability graphs. See:  Golumbic, Martin Charles (1977), "Comparability graphs and a new matroid", Journal of Combinatorial Theory, Series B, 22 (1): 68-90, https://doi.org/10.1016%2F0095-8956%2877%2990049-1, https://www.ams.org/mathscinet-getitem?mr=0439689

#91 by Bill McEachen at Mon Nov 22 14:19:58 EST 2021

COMMENTS

A000079 is a subsequence, A000400 and A009968 are all subsequences. - Bill McEachen, Nov 18 2021

CROSSREFS

Cf. A000079, A000400, A009968. - _Bill McEachen_, Nov 22 2021

STATUS

proposed

editing

Discussion

Mon Nov 22

14:20

Bill McEachen: ok, done, thanks.