A202576 Number of nX2 0..3 arrays with the row and column sums nondecreasing

10, 90, 616, 3731, 20208, 102665, 492118, 2275947, 10175908, 44549594, 190996160, 808576340, 3377247432, 13999854480, 57518174798, 235275969669, 956569084218, 3879844758272, 15670308778784, 63219573247523, 254277270362900

Offset

1,1

Comments

Column 2 of A202581

Links

R. H. Hardin, Table of n, a(n) for n = 1..51

Example

Some solutions for n=5
..0..1....1..2....0..3....0..1....0..3....1..3....1..1....1..1....1..0....0..1
..1..1....0..3....3..0....2..0....1..2....1..3....2..1....1..2....1..3....0..2
..1..1....3..1....0..3....0..3....3..2....2..2....1..2....1..2....2..2....0..2
..1..1....3..1....1..3....1..2....3..2....1..3....2..1....1..3....2..2....1..3
..2..3....1..3....3..3....3..2....2..3....3..1....1..2....1..3....3..2....2..3

Crossrefs

Sequence in context: A044261 A065690 A202919 * A201723 A228418 A306958

Adjacent sequences: A202573 A202574 A202575 * A202577 A202578 A202579

Keyword

nonn

Author

R. H. Hardin Dec 21 2011

Status

approved