A266356 Number of n X n binary arrays with rows and columns lexicographically nondecreasing and row and column sums nondecreasing.

2, 7, 35, 276, 3669, 93085, 5061414, 654427939

Offset

1,1

Comments

Diagonal of A266362.

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Cf. A266362.

Sequence in context: A058129 A101514 A247240 * A196857 A111908 A060814

Adjacent sequences: A266353 A266354 A266355 * A266357 A266358 A266359

Keyword

nonn

Author

R. H. Hardin, Dec 28 2015

Status

approved