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A318418 Number of nXn 0..1 arrays with every element unequal to 0, 2, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 0
1, 2, 2, 18, 129, 783, 11802, 236755, 5897333, 182618347, 7672658026, 436957466532 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A318423.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A318423.

Sequence in context: A173785 A264715 A294341 * A184317 A141084 A172194

Adjacent sequences:  A318415 A318416 A318417 * A318419 A318420 A318421

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 26 2018

STATUS

approved

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Last modified September 17 19:12 EDT 2019. Contains 327137 sequences. (Running on oeis4.)