A266358 Number of nX4 binary arrays with rows and columns lexicographically nondecreasing and row and column sums nondecreasing.

5, 22, 82, 276, 830, 2278, 5752, 13525, 29864, 62455, 124501, 237951, 438085, 780124, 1348276, 2268306, 3724141, 5980163, 9410094, 14534556, 22068734, 32983206, 48579531, 70584895, 101268301, 143583339, 201341148, 279420500, 384018844

Offset

1,1

Comments

Column 4 of A266362.

Links

R. H. Hardin, Table of n, a(n) for n = 1..61

Example

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

Crossrefs

Cf. A266362.

Sequence in context: A058752 A234351 A255802 * A183925 A296583 A216041

Adjacent sequences: A266355 A266356 A266357 * A266359 A266360 A266361

Keyword

nonn

Author

R. H. Hardin, Dec 28 2015

Status

approved