A269093 Number of nX4 0..3 arrays with some element plus some horizontally or vertically adjacent neighbor totalling three exactly once.

108, 11424, 715320, 37963968, 1856325000, 86415197088, 3892946216856, 171307237216320, 7406621052177000, 315868041326151072, 13323538607075686392, 556962735401445373632, 23108630644746952831560

Offset

1,1

Comments

Column 4 of A269097.

Links

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

Formula

Empirical: a(n) = 90*a(n-1) -2559*a(n-2) +24556*a(n-3) -94959*a(n-4) +140442*a(n-5) -69169*a(n-6) for n>7

Example

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

Crossrefs

Cf. A269097.

Sequence in context: A132053 A273439 A164748 * A113853 A209043 A269272

Adjacent sequences: A269090 A269091 A269092 * A269094 A269095 A269096

Keyword

nonn

Author

R. H. Hardin, Feb 19 2016

Status

approved