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A317808
Number of nXn 0..1 arrays with every element unequal to 0, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
0
1, 2, 2, 7, 38, 142, 1575, 13712, 112854, 1446948, 21089268, 358570823, 7306257506
OFFSET
1,2
COMMENTS
Diagonal of A317815.
EXAMPLE
Some solutions for n=5
..0..1..0..0..0. .0..1..0..0..1. .0..1..0..1..0. .0..1..0..0..0
..1..1..1..1..1. .1..1..1..1..0. .1..0..0..1..1. .1..1..1..1..1
..0..1..1..0..0. .0..1..1..0..0. .1..0..1..1..0. .0..1..1..0..0
..0..1..0..0..1. .0..1..0..0..0. .0..1..1..0..0. .0..1..0..0..1
..1..0..1..1..0. .1..0..0..0..0. .0..1..0..0..0. .0..1..0..1..0
CROSSREFS
Cf. A317815.
Sequence in context: A242032 A350019 A298440 * A326909 A343260 A246053
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 07 2018
STATUS
approved