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A303683 Number of n X n 0..1 arrays with every element unequal to 2, 3 or 4 king-move adjacent elements, with upper left element zero. 0
0, 3, 2, 138, 349, 19068, 99205, 5047477, 58634971, 2949491750, 84689499509, 5678370893063 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A303690.

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A303690.

Sequence in context: A076931 A076932 A244083 * A187825 A297532 A037057

Adjacent sequences:  A303680 A303681 A303682 * A303684 A303685 A303686

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 28 2018

STATUS

approved

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Last modified September 18 04:07 EDT 2021. Contains 347506 sequences. (Running on oeis4.)