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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 0
3, 7, 22, 109, 753, 6374, 62205, 676983, 8026548, 101907085, 1368004992, 19233435438, 281169127711, 4249797119751, 66116288446463 (list; graph; refs; listen; history; text; internal format)
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: A038147 A252784 A082271 * A069505 A355075 A173878

Adjacent sequences: A229435 A229436 A229437 * A229439 A229440 A229441

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 23 2013

STATUS

approved

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Last modified January 31 14:31 EST 2023. Contains 359975 sequences. (Running on oeis4.)