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A318009 Number of nXn 0..1 arrays with every element unequal to 0, 1, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 0
1, 8, 118, 3062, 133136, 10674882, 1493271874, 372575745070, 164750515621344, 129310307945204804, 180180042920234266842, 445515876091580535689544 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A318016.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A318016.

Sequence in context: A194494 A230911 A267752 * A228752 A116008 A086302

Adjacent sequences:  A318006 A318007 A318008 * A318010 A318011 A318012

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 12 2018

STATUS

approved

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Last modified January 15 13:34 EST 2021. Contains 340187 sequences. (Running on oeis4.)