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A316687 Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 6, 7 or 8 king-move adjacent elements, with upper left element zero. 0
1, 4, 8, 23, 88, 2081, 61454, 2431114, 257262996, 52155197669, 17033276992389, 11335703888987492, 14840834772251861064, 35171617032782262638585 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A316693.

LINKS

Table of n, a(n) for n=1..14.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A316693.

Sequence in context: A026596 A181688 A243557 * A083504 A277291 A254731

Adjacent sequences:  A316684 A316685 A316686 * A316688 A316689 A316690

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 10 2018

STATUS

approved

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Last modified June 16 13:37 EDT 2019. Contains 324152 sequences. (Running on oeis4.)