A266545 Number of nX6 binary arrays with rows and columns lexicographically nondecreasing and row and column sums nonincreasing.

2, 5, 11, 27, 58, 176, 366, 1062, 2571, 7345, 17540, 47970, 109375, 272134, 595031, 1359839, 2827311, 6072251, 12027150, 24388681, 46416427, 89575530, 164016985, 303788687, 537614351, 959313275, 1647205384

Offset: 1

Author

R. H. Hardin, Dec 31 2015

Keywords

• nonn

Comments

Column 6 of A266547.

Examples

			Some solutions for n=6
..0..0..0..1..1..1....0..0..0..1..1..1....0..0..0..1..1..1....0..0..0..1..1..1
..0..1..1..0..0..0....0..1..1..0..0..1....0..0..1..0..1..1....0..0..1..0..1..1
..1..0..0..0..0..0....1..0..0..1..1..0....0..1..1..0..0..0....0..1..1..0..0..1
..1..0..0..0..0..0....1..1..1..0..0..0....1..0..0..1..0..0....1..0..1..0..1..0
..1..0..0..0..0..0....1..1..1..0..0..0....1..1..0..0..0..0....1..1..0..1..0..0
..1..0..0..0..0..0....1..1..1..0..0..0....1..1..0..0..0..0....1..1..0..1..0..0
		

Crossrefs

Cf. A266547.