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A266433 Number of 7Xn binary arrays with rows and columns lexicographically nondecreasing and column sums nondecreasing. 1
8, 70, 826, 12758, 223075, 3825307, 59155748, 798834778, 9379683461, 96481143688, 879275711012, 7183343579974, 53182973236784, 360298764101463, 2252503422916387, 13090825673375302, 71176326297105679, 364068218093477268 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 7 of A266428.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

R. H. Hardin, Empirical polynomial of degree 57

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.

Sequence in context: A322416 A287482 A053729 * A267244 A228388 A020532

Adjacent sequences:  A266430 A266431 A266432 * A266434 A266435 A266436

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 29 2015

STATUS

approved

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Last modified August 14 08:08 EDT 2020. Contains 336480 sequences. (Running on oeis4.)