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A316642 Number of nXn 0..1 arrays with every element unequal to 1, 2, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero. 0
0, 3, 15, 42, 3988, 43604, 1396674, 331807728, 22368384180, 4961341851222 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A316648.

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A316648.

Sequence in context: A219085 A093627 A192060 * A146805 A147057 A330322

Adjacent sequences:  A316639 A316640 A316641 * A316643 A316644 A316645

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 09 2018

STATUS

approved

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Last modified July 28 23:07 EDT 2021. Contains 346340 sequences. (Running on oeis4.)