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A317856
Number of nXn 0..1 arrays with every element unequal to 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
0
0, 3, 4, 56, 350, 3315, 33238, 517734, 8875636, 219127394, 6925306920
OFFSET
1,2
COMMENTS
Diagonal of A317863.
EXAMPLE
Some solutions for n=5
..0..0..1..0..0. .0..0..0..0..0. .0..0..1..0..0. .0..1..0..1..0
..1..0..0..0..1. .1..1..1..0..1. .1..0..0..1..1. .1..1..1..1..0
..0..0..0..0..0. .1..1..0..0..0. .0..0..0..1..0. .1..1..1..1..0
..0..1..1..0..0. .0..1..1..0..1. .1..0..0..0..0. .0..1..0..0..1
..0..1..0..0..1. .1..1..0..0..0. .0..0..1..0..1. .1..1..0..0..0
CROSSREFS
Cf. A317863.
Sequence in context: A272337 A132678 A166850 * A331725 A067093 A041105
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 09 2018
STATUS
approved