A265473 - OEIS

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

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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