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A304266 Number of nX4 0..1 arrays with every element unequal to 0, 1, 5 or 8 king-move adjacent elements, with upper left element zero. 1
5, 5, 10, 21, 50, 116, 259, 601, 1397, 3196, 7359, 17016, 39172, 90185, 208017, 479413, 1104402, 2545521, 5866934, 13519272, 31155923, 71803941, 165473389, 381338852, 878829251, 2025313404, 4667430712, 10756397233, 24788787493, 57127147381 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A304270.

LINKS

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

FORMULA

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

EXAMPLE

Some solutions for n=5

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

..0..0..0..0. .0..0..0..0. .0..0..0..0. .0..0..0..0. .0..0..0..0

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

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

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

CROSSREFS

Cf. A304270.

Sequence in context: A022088 A245418 A082450 * A212344 A298181 A290332

Adjacent sequences:  A304263 A304264 A304265 * A304267 A304268 A304269

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 09 2018

STATUS

approved

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Last modified October 23 00:39 EDT 2021. Contains 348211 sequences. (Running on oeis4.)