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A265442 Number of nX3 0..n+3-2 arrays with upper left zero and lower right n+3-2 and each element differing from its horizontal and vertical neighbors by one or two. 1
1, 2, 145, 2825, 25069, 174794, 2345091, 44474575, 628376593, 6864539181, 75699824370, 1039086421471, 15223222698435, 201831079064335, 2472305615455965, 31106656429366406, 419291616977108585 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A265447.

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A265447.

Sequence in context: A228507 A254499 A071064 * A014080 A182478 A214910

Adjacent sequences:  A265439 A265440 A265441 * A265443 A265444 A265445

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 09 2015

STATUS

approved

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Last modified February 25 08:42 EST 2020. Contains 332221 sequences. (Running on oeis4.)