A266422 Number of n X n binary arrays with rows and columns lexicographically nondecreasing and column sums nondecreasing.

2, 7, 39, 404, 8764, 448649, 59155748, 21325003746, 21901867532457, 66087854484252677, 600640567173169508177

Offset: 1

Author

R. H. Hardin, Dec 29 2015

Keywords

• nonn

Comments

Diagonal of A266428.

Examples

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

Crossrefs

Cf. A266428.