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A302961 Number of nX4 0..1 arrays with every element equal to 0, 1, 2, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1
8, 105, 786, 6206, 49521, 395493, 3157171, 25208524, 201291251, 1607313882, 12834468946, 102483891605, 818339663167, 6534489434899, 52178280478900, 416646642993447, 3326948061363744, 26565877137213190, 212130102108362955 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A302965.

LINKS

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

FORMULA

Empirical: a(n) = 10*a(n-1) -7*a(n-2) -65*a(n-3) -84*a(n-4) +100*a(n-5) +541*a(n-6) +1363*a(n-7) -386*a(n-8) -2958*a(n-9) -6187*a(n-10) +2238*a(n-11) +4139*a(n-12) +7410*a(n-13) -4494*a(n-14) +2183*a(n-15) -3163*a(n-16) +1920*a(n-17) -1968*a(n-18) +256*a(n-19) for n>20

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A302965.

Sequence in context: A119934 A247537 A302261 * A302804 A303465 A239400

Adjacent sequences:  A302958 A302959 A302960 * A302962 A302963 A302964

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 16 2018

STATUS

approved

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Last modified July 30 16:50 EDT 2021. Contains 346359 sequences. (Running on oeis4.)