A224304 Number of n X n 0..2 arrays with diagonals and rows unimodal and antidiagonals nondecreasing

3, 54, 1586, 45453, 1258372, 33934344, 911404794, 24751091876, 685844521863, 19455144713950, 564670981724616, 16727123708223072, 504154243224589510, 15415190705591603814

Offset

1,1

Comments

Diagonal of A224310

Links

Table of n, a(n) for n=1..14.

Example

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

Crossrefs

Sequence in context: A376282 A317663 A323325 * A266523 A157550 A224368

Adjacent sequences: A224301 A224302 A224303 * A224305 A224306 A224307

Keyword

nonn

Author

R. H. Hardin Apr 03 2013

Status

approved