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A302303 Number of nXn 0..1 arrays with every element equal to 0, 1, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 0
1, 3, 13, 66, 445, 5715, 76642, 2150420, 124691962, 17216491876 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A302309.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A302309.

Sequence in context: A045743 A110530 A142979 * A201713 A298611 A136784

Adjacent sequences:  A302300 A302301 A302302 * A302304 A302305 A302306

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 05 2018

STATUS

approved

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Last modified February 19 13:03 EST 2020. Contains 332044 sequences. (Running on oeis4.)