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A317758 Number of nXn 0..1 arrays with every element unequal to 0, 1 or 2 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 0
1, 6, 16, 43, 109, 266, 639, 1529, 3674, 8909, 21853, 54252, 136213, 345373, 882828, 2271143, 5871373, 15234214, 39633091, 103306417, 269641062, 704462713, 1841692605, 4816973880, 12602801545 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A317764.

LINKS

Table of n, a(n) for n=1..25.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A317764.

Sequence in context: A283330 A263325 A107614 * A010915 A260384 A126360

Adjacent sequences:  A317755 A317756 A317757 * A317759 A317760 A317761

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 06 2018

STATUS

approved

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Last modified October 18 12:18 EDT 2019. Contains 328160 sequences. (Running on oeis4.)