The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A005156 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A005156

Number of alternating sign 2n+1 X 2n+1 matrices symmetric about the vertical axis (VSASM's); also 2n X 2n off-diagonally symmetric alternating sign matrices (OSASM's).
(history; published version)

#55 by Alois P. Heinz at Mon Jun 28 15:39:44 EDT 2021

STATUS

proposed

approved

#54 by Michael De Vlieger at Mon Jun 28 15:07:25 EDT 2021

STATUS

editing

proposed

#53 by Michael De Vlieger at Mon Jun 28 15:07:22 EDT 2021

LINKS

Paul Barry, <a href="https://arxiv.org/abs/2104.01644">Centered polygon numbers, heptagons and nonagons, and the Robbins numbers</a>, arXiv:2104.01644 [math.CO], 2021.

STATUS

approved

editing

#52 by Joerg Arndt at Sun Mar 15 02:29:24 EDT 2020

STATUS

reviewed

approved

#51 by Michel Marcus at Sun Mar 15 02:10:43 EDT 2020

STATUS

proposed

reviewed

#50 by Michael De Vlieger at Sat Mar 14 19:35:16 EDT 2020

STATUS

editing

proposed

#49 by Michael De Vlieger at Sat Mar 14 19:35:13 EDT 2020

LINKS

Paul Barry, <a href="https://arxiv.org/abs/1912.11845">Chebyshev moments and Riordan involutions</a>, arXiv:1912.11845 [math.CO], 2019.

STATUS

approved

editing

#48 by Alois P. Heinz at Fri Mar 22 07:16:07 EDT 2019

STATUS

proposed

approved

#47 by Michel Marcus at Fri Mar 22 02:30:42 EDT 2019

STATUS

editing

proposed

#46 by Michel Marcus at Fri Mar 22 02:30:38 EDT 2019

REFERENCES

R. P. Stanley, A baker's dozen of conjectures concerning plane partitions, pp. 285-293 of "Combinatoire Enumerative (Montreal 1985)", Lect. Notes Math. 1234, 1986.

LINKS

R. P. Stanley, <a href="http://dx.doi.org/10.1007/BFb0072521">A baker's dozen of conjectures concerning plane partitions</a>, pp. 285-293 of "Combinatoire Enumerative (Montreal 1985)", Lect. Notes Math. 1234, 1986.

STATUS

proposed

editing