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

1,1

Comments

Column 2 of A202560

Links

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

Example

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

Crossrefs

Sequence in context: A140176 A238496 A097391 * A034481 A295061 A247374

Adjacent sequences: A202551 A202552 A202553 * A202555 A202556 A202557

Keyword

nonn

Author

R. H. Hardin Dec 21 2011

Status

approved