A266934 Number of nX7 binary arrays with rows lexicographically nondecreasing and columns lexicographically nondecreasing and row sums nondecreasing and column sums nonincreasing.

2, 6, 21, 115, 816, 7185, 68890, 671796, 6347005, 56180274, 460040399, 3470013146, 24151911854, 155703390684

Offset: 1

Author

R. H. Hardin, Jan 06 2016

Keywords

• nonn

Comments

Column 7 of A266935.

Examples

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

Crossrefs

Cf. A266935.