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A302723 Number of nXn 0..1 arrays with every element equal to 1, 2, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 0
0, 3, 22, 89, 1307, 20842, 532511, 17200486, 683140749, 61552556640 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A302728.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A302728.

Sequence in context: A275290 A277228 A302272 * A095663 A254332 A009029

Adjacent sequences:  A302720 A302721 A302722 * A302724 A302725 A302726

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 12 2018

STATUS

approved

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Last modified January 23 01:15 EST 2020. Contains 331166 sequences. (Running on oeis4.)