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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
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 * A368911 A228752 A360978
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 12 2018
STATUS
approved

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Last modified March 1 13:56 EST 2024. Contains 370433 sequences. (Running on oeis4.)