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A269093 Number of nX4 0..3 arrays with some element plus some horizontally or vertically adjacent neighbor totalling three exactly once. 1
108, 11424, 715320, 37963968, 1856325000, 86415197088, 3892946216856, 171307237216320, 7406621052177000, 315868041326151072, 13323538607075686392, 556962735401445373632, 23108630644746952831560 (list; graph; refs; listen; history; text; internal format)
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

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Last modified November 29 02:51 EST 2022. Contains 358421 sequences. (Running on oeis4.)