The On-Line Encyclopedia of Integer Sequences (OEIS)

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A266433

Number of 7Xn binary arrays with rows and columns lexicographically nondecreasing and column sums nondecreasing.
(history; published version)

#4 by R. H. Hardin at Tue Dec 29 10:20:02 EST 2015

STATUS

editing

approved

#3 by R. H. Hardin at Tue Dec 29 10:19:59 EST 2015

LINKS

R. H. Hardin, <a href="/A266433/b266433.txt">Table of n, a(n) for n = 1..210</a>

R. H. Hardin, <a href="/A266433/a266433.txt">Empirical polynomial of degree 57</a>

#2 by R. H. Hardin at Tue Dec 29 10:19:23 EST 2015

NAME

allocated for R. H. Hardin

Number of 7Xn binary arrays with rows and columns lexicographically nondecreasing and column sums nondecreasing.

DATA

8, 70, 826, 12758, 223075, 3825307, 59155748, 798834778, 9379683461, 96481143688, 879275711012, 7183343579974, 53182973236784, 360298764101463, 2252503422916387, 13090825673375302, 71176326297105679, 364068218093477268

OFFSET

1,1

COMMENTS

Row 7 of A266428.

FORMULA

Empirical polynomial of degree 57 (see link above)

EXAMPLE

Some solutions for n=4

..0..0..0..0....0..0..0..0....0..0..1..1....0..0..0..0....0..0..0..1

..0..0..1..1....0..0..0..0....0..1..0..1....0..0..1..1....0..0..0..1

..0..0..1..1....0..0..0..1....0..1..1..0....0..0..1..1....0..0..0..1

..0..1..0..1....0..0..0..1....0..1..1..1....0..1..0..0....0..1..1..0

..0..1..0..1....0..0..0..1....1..0..0..0....0..1..0..1....0..1..1..0

..1..0..1..1....0..1..1..0....1..0..1..0....0..1..0..1....1..0..0..1

..1..1..0..0....0..1..1..0....1..1..0..1....1..0..1..0....1..0..1..1

CROSSREFS

Cf. A266428.

KEYWORD

allocated

nonn

AUTHOR

R. H. Hardin, Dec 29 2015

STATUS

approved

editing

#1 by R. H. Hardin at Tue Dec 29 09:47:48 EST 2015

NAME

allocated for R. H. Hardin

KEYWORD

allocated

STATUS

approved