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A303681 Number of nX7 0..1 arrays with every element unequal to 0, 1 or 3 king-move adjacent elements, with upper left element zero. 1
21, 103, 57, 90, 150, 245, 367, 509, 697, 957, 1311, 1851, 2671, 3869, 5547, 7907, 11275, 16101, 22959, 32717, 46663, 66633, 95139, 135763, 193701, 276435, 394533, 563013, 803377, 1146445, 1636117, 2334893, 3331971, 4754851, 6785501, 9683407 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A303682.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +a(n-4) +a(n-8) for n>14

EXAMPLE

Some solutions for n=5

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

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

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

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

CROSSREFS

Cf. A303682.

Sequence in context: A044653 A076454 A208538 * A304132 A304220 A305481

Adjacent sequences:  A303678 A303679 A303680 * A303682 A303683 A303684

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 28 2018

STATUS

approved

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Last modified July 29 17:41 EDT 2021. Contains 346346 sequences. (Running on oeis4.)