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, 2, 145, 2825, 25069, 174794, 2345091, 44474575, 628376593, 6864539181, 75699824370, 1039086421471, 15223222698435, 201831079064335, 2472305615455965, 31106656429366406, 419291616977108585

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