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A316919 Number of nXn 0..1 arrays with every element unequal to 0, 1, 3, 4, 5, 6 or 7 king-move adjacent elements, with upper left element zero. 0
1, 5, 13, 137, 6339, 533726, 493774680, 1580858618327, 13171868574537481 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A316925.

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A316925.

Sequence in context: A004063 A005764 A305643 * A099974 A247820 A336097

Adjacent sequences:  A316916 A316917 A316918 * A316920 A316921 A316922

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 16 2018

STATUS

approved

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Last modified January 24 21:49 EST 2022. Contains 350565 sequences. (Running on oeis4.)