A265473 Number of n X n 0..2n-2 arrays with upper left zero and lower right 2n-2 and each element differing from its diagonal and antidiagonal neighbors by one or two.

1, 6, 1376, 1211112, 4131348480, 49965944917500, 2284546587678218240, 399352031269643676301056

Offset

1,2

Comments

Diagonal of A265480.

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for n=3
..0..2..0....0..3..0....0..2..0....0..4..3....0..2..1....0..2..4....0..1..0
..0..2..0....4..2..2....4..2..3....3..2..3....3..2..3....4..2..4....0..2..0
..3..2..4....4..3..4....0..2..4....0..2..4....0..1..4....0..3..4....3..2..4

Crossrefs

Cf. A265480.

Sequence in context: A279924 A307871 A195646 * A199645 A300025 A107252

Adjacent sequences: A265470 A265471 A265472 * A265474 A265475 A265476

Keyword

nonn

Author

R. H. Hardin, Dec 09 2015

Status

approved