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A265439 Number of n X n 0..2n-2 arrays with upper left zero and lower right 2n-2 and each element differing from its horizontal and vertical neighbors by one or two. 0
1, 1, 145, 57721, 41855199, 569620472894, 7361174970568815, 1484662166072017164173, 589336120060277543986621142 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Diagonal of A265447.

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=4

..0..2..4..2....0..2..1..2....0..2..0..1....0..2..3..4....0..2..4..5

..2..0..2..4....2..1..3..4....2..3..1..2....1..3..1..3....2..3..5..6

..1..2..4..5....3..2..4..5....0..1..2..4....3..1..2..4....4..5..6..4

..3..4..5..6....5..4..5..6....1..3..4..6....1..2..4..6....2..3..4..6

CROSSREFS

Cf. A265447.

Sequence in context: A226849 A097730 A283520 * A060720 A015081 A015055

Adjacent sequences:  A265436 A265437 A265438 * A265440 A265441 A265442

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 09 2015

STATUS

approved

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Last modified December 7 04:21 EST 2021. Contains 349567 sequences. (Running on oeis4.)