A266433 - OEIS

A266433

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

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

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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