A266546 Number of nX7 binary arrays with rows and columns lexicographically nondecreasing and row and column sums nonincreasing.

2, 5, 13, 36, 110, 366, 1688, 5312, 24921, 101495, 417118, 1673507, 6081357, 22843019, 72935735, 238112928, 734665224, 2185350505

Offset: 1

Author

R. H. Hardin, Dec 31 2015

Keywords

• nonn

Comments

Column 7 of A266547.

Examples

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

Crossrefs

Cf. A266547.