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A302619 Number of nX4 0..1 arrays with every element equal to 0, 1, 2 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1
8, 37, 45, 130, 367, 917, 2533, 6871, 18334, 49596, 133871, 360493, 972318, 2622309, 7069651, 19062876, 51403186, 138601138, 373723944, 1007717328, 2717208445, 7326688182, 19755736142, 53269455264, 143635996311, 387300855495 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A302623.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +3*a(n-2) +6*a(n-3) -a(n-4) -8*a(n-5) -7*a(n-6) +2*a(n-7) +5*a(n-8) for n>10

EXAMPLE

Some solutions for n=5

..0..0..1..0. .0..1..0..0. .0..0..1..0. .0..1..0..1. .0..1..0..1

..0..1..1..0. .0..1..0..1. .1..0..1..0. .0..1..1..1. .0..0..0..1

..0..1..0..0. .0..1..0..0. .1..0..0..0. .0..1..0..1. .0..1..0..1

..0..1..0..1. .1..0..1..1. .1..0..1..0. .1..1..0..1. .1..1..0..1

..1..1..0..0. .1..0..1..0. .1..0..1..0. .1..0..0..0. .0..0..1..0

CROSSREFS

Cf. A302623.

Sequence in context: A261846 A110215 A281465 * A302411 A303178 A250168

Adjacent sequences:  A302616 A302617 A302618 * A302620 A302621 A302622

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 10 2018

STATUS

approved

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Last modified October 18 12:19 EDT 2021. Contains 348067 sequences. (Running on oeis4.)