A265443 Number of nX4 0..n+4-2 arrays with upper left zero and lower right n+4-2 and each element differing from its horizontal and vertical neighbors by one or two.

2, 53, 2825, 57721, 744805, 19827238, 901139380, 27582975041, 585047767454, 12075039660966, 359970464643303, 12067493373744711, 338956805544196323, 8183389364550726340, 205413155196816637232, 5971274995018639609623

Offset

1,1

Comments

Column 4 of A265447.

Links

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

Example

Some solutions for n=4
..0..1..3..4....0..2..4..5....0..2..3..4....0..1..3..5....0..2..3..4
..2..3..5..3....2..4..5..3....2..4..2..3....1..3..4..3....2..3..4..3
..4..5..6..4....3..5..4..5....3..2..4..5....2..4..6..5....3..1..3..5
..5..6..5..6....5..4..5..6....5..3..5..6....4..6..5..6....4..3..4..6

Crossrefs

Cf. A265447.

Sequence in context: A119777 A176943 A176946 * A234603 A087865 A278843

Adjacent sequences: A265440 A265441 A265442 * A265444 A265445 A265446

Keyword

nonn

Author

R. H. Hardin, Dec 09 2015

Status

approved