A229438 Number of n X n 0..2 arrays with horizontal differences mod 3 never 1, vertical differences mod 3 never -1, and rows and columns lexicographically nondecreasing

3, 7, 22, 109, 753, 6374, 62205, 676983, 8026548, 101907085, 1368004992, 19233435438, 281169127711, 4249797119751, 66116288446463

Offset

1,1

Comments

Diagonal of A229445

Links

Table of n, a(n) for n=1..15.

Example

Some solutions for n=4
..0..2..2..2....0..2..2..2....0..2..2..2....0..0..0..0....1..1..1..1
..1..0..2..2....1..0..0..2....1..0..0..2....1..1..1..1....2..2..2..2
..1..1..0..0....2..1..1..0....1..1..1..0....1..1..1..1....2..2..2..2
..2..1..0..0....2..1..1..1....2..1..1..0....2..2..2..2....2..2..2..2

Crossrefs

Sequence in context: A252784 A364627 A082271 * A069505 A363544 A355075

Adjacent sequences: A229435 A229436 A229437 * A229439 A229440 A229441

Keyword

nonn

Author

R. H. Hardin Sep 23 2013

Status

approved