A266361 Number of nX7 binary arrays with rows and columns lexicographically nondecreasing and row and column sums nondecreasing.

8, 70, 614, 5752, 55734, 541207, 5061414, 44435916, 361401441, 2711340372, 18782567690, 120573237565, 720624005211

Offset

1,1

Comments

Column 7 of A266362.

Links

Table of n, a(n) for n=1..13.

Example

Some solutions for n=4
..0..0..0..0..0..0..0....0..0..0..0..0..1..1....0..0..0..0..1..1..1
..0..0..0..0..0..1..1....0..1..1..1..1..0..0....0..0..0..1..0..1..1
..0..0..0..0..1..1..1....1..0..0..1..1..1..1....0..1..1..0..1..0..1
..0..0..1..1..1..1..1....1..1..1..0..1..1..1....1..1..1..1..0..0..0

Crossrefs

Cf. A266362.

Sequence in context: A293069 A056631 A190560 * A298281 A299355 A299175

Adjacent sequences: A266358 A266359 A266360 * A266362 A266363 A266364

Keyword

nonn

Author

R. H. Hardin, Dec 28 2015

Status

approved