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A303010 Number of nXn 0..1 arrays with every element equal to 0, 1, 2, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 0
1, 8, 68, 1047, 27719, 1298140, 121524556, 18974341664, 5433457482034 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A303016.

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A303016.

Sequence in context: A113357 A030992 A091590 * A087487 A178368 A111156

Adjacent sequences:  A303007 A303008 A303009 * A303011 A303012 A303013

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 17 2018

STATUS

approved

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Last modified February 26 21:18 EST 2020. Contains 332295 sequences. (Running on oeis4.)