A265454 Number of nX4 0..n+4-2 arrays with each element differing from its horizontal and vertical neighbors by one or two.

66, 3358, 216466, 13943772, 871209026, 52509347006, 3073046007824, 175659478218938, 9853875472731614, 544420779803461484, 29705625866016751450, 1604088383366277766514, 85864081342833064010380

Offset

1,1

Comments

Column 4 of A265458.

Links

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

Example

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

Crossrefs

Cf. A265458.

Sequence in context: A062152 A138875 A138877 * A004998 A239409 A295592

Adjacent sequences: A265451 A265452 A265453 * A265455 A265456 A265457

Keyword

nonn

Author

R. H. Hardin, Dec 09 2015

Status

approved