A202554 Number of nX2 0,1 arrays with the row and column sums nondecreasing.

3, 8, 17, 37, 73, 151, 293, 598, 1159, 2358, 4581, 9314, 18143, 36880, 72001, 146325, 286185, 581427, 1138813, 2312865, 4535493, 9207989, 18074789, 36682275, 72066977, 146206411, 287454709, 582979035, 1146938817, 2325328271, 4577459549

Offset: 1

Author

R. H. Hardin Dec 21 2011

Keywords

• nonn

Comments

Column 2 of A202560

Examples

			Some solutions for n=10
..0..1....1..0....0..0....0..0....0..0....0..1....0..1....0..0....0..0....0..0
..0..1....0..1....0..0....0..1....0..0....1..0....0..1....0..0....0..1....0..1
..0..1....1..0....0..0....0..1....0..0....1..0....1..0....0..1....1..0....1..0
..0..1....0..1....0..1....1..0....0..1....0..1....0..1....0..1....0..1....0..1
..0..1....1..0....0..1....1..0....0..1....1..0....0..1....0..1....1..0....0..1
..0..1....0..1....0..1....1..0....0..1....0..1....0..1....1..0....0..1....1..0
..1..0....0..1....1..0....1..0....0..1....0..1....0..1....1..1....0..1....0..1
..1..0....1..0....1..0....0..1....0..1....0..1....0..1....1..1....1..1....1..0
..1..0....0..1....0..1....0..1....0..1....0..1....1..0....1..1....1..1....0..1
..1..0....1..0....1..1....0..1....1..1....1..1....1..1....1..1....1..1....0..1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210