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A318418
Number of nXn 0..1 arrays with every element unequal to 0, 2, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
0
1, 2, 2, 18, 129, 783, 11802, 236755, 5897333, 182618347, 7672658026, 436957466532
OFFSET
1,2
COMMENTS
Diagonal of A318423.
EXAMPLE
Some solutions for n=5
..0..1..0..0..1. .0..1..1..0..0. .0..0..0..1..0. .0..0..1..0..0
..1..0..1..0..0. .1..0..1..0..0. .0..0..1..1..1. .0..1..1..1..1
..0..0..0..1..0. .1..1..1..1..1. .0..1..1..0..0. .1..1..0..1..0
..1..1..0..0..1. .0..0..1..1..0. .1..1..0..0..1. .0..1..1..0..0
..1..1..0..1..0. .0..0..1..0..1. .0..1..0..1..1. .0..1..0..0..0
CROSSREFS
Cf. A318423.
Sequence in context: A173785 A264715 A294341 * A184317 A141084 A172194
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 26 2018
STATUS
approved