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A300466
Number of n X n 0..1 arrays with every element equal to 0, 1, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
0
1, 8, 160, 8608, 1231578, 462538206, 456303004550, 1184061531948168, 8081950028633306006, 145086737722751262521230, 6849888315993282295524030922
OFFSET
1,2
COMMENTS
Diagonal of A300472.
EXAMPLE
Some solutions for n=5
..0..0..0..0..0. .0..0..0..0..1. .0..0..0..0..0. .0..0..0..0..1
..1..1..0..1..1. .1..1..0..1..0. .0..1..1..0..1. .1..1..0..0..0
..0..0..1..0..0. .0..0..1..1..0. .0..0..1..1..0. .0..1..1..1..0
..0..1..0..1..1. .1..1..0..1..1. .1..0..0..1..1. .0..1..0..0..1
..0..0..0..1..1. .1..0..0..0..0. .1..1..0..1..0. .1..0..1..1..0
CROSSREFS
Cf. A300472.
Sequence in context: A221077 A052140 A219265 * A184605 A195607 A064755
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 06 2018
STATUS
approved