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A318038 Number of nXn 0..1 arrays with every element unequal to 0, 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 0
1, 2, 8, 140, 10563, 2098813, 1097286743, 1507709268026, 5360839557388973, 49384396585140778697 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A318045.

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A318045.

Sequence in context: A193203 A259126 A140050 * A304798 A154908 A166356

Adjacent sequences:  A318035 A318036 A318037 * A318039 A318040 A318041

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 13 2018

STATUS

approved

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Last modified September 18 01:54 EDT 2021. Contains 347504 sequences. (Running on oeis4.)