A203326 Number of nX4 0..2 arrays with the row and column sums nondecreasing.

15, 510, 15300, 423595, 10809576, 261192161, 6027116491, 134485617080, 2917085859508, 61924067072669, 1290589596346709, 26510790447480014, 537817266328044268, 10801401586708316358, 215047466285433025231

Offset

1,1

Comments

Column 4 of A203330

Links

R. H. Hardin, Table of n, a(n) for n = 1..20

Example

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

Crossrefs

Sequence in context: A004703 A218188 A218365 * A092561 A218312 A218280

Adjacent sequences: A203323 A203324 A203325 * A203327 A203328 A203329

Keyword

nonn

Author

R. H. Hardin, Dec 31 2011

Status

approved