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A265441 Number of nX2 0..n+2-2 arrays with upper left zero and lower right n+2-2 and each element differing from its horizontal and vertical neighbors by one or two. 1
1, 1, 2, 53, 455, 2218, 9702, 59956, 444998, 2915881, 16984838, 100144150, 638465320, 4169033187, 26450244798, 164385366814, 1031338919194, 6581317747223, 42129509368387, 268046060285802, 1701181410512570 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 2 of A265447.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=4

..0..2....0..2....0..2....0..1....0..2....0..1....0..2....0..2....0..2....0..2

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

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

..3..4....3..4....2..4....2..4....2..4....3..4....3..4....3..4....2..4....2..4

CROSSREFS

Cf. A265447.

Sequence in context: A142477 A119112 A109791 * A119777 A176943 A176946

Adjacent sequences:  A265438 A265439 A265440 * A265442 A265443 A265444

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 09 2015

STATUS

approved

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Last modified January 26 01:48 EST 2020. Contains 331270 sequences. (Running on oeis4.)