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A303096
Number of n X n 0..1 arrays with every element equal to 1, 2, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
0
0, 3, 77, 4667, 1138331, 906385523, 2441756629583, 22050004579190301, 670548945799312331099
OFFSET
1,2
COMMENTS
Diagonal of A303102.
EXAMPLE
Some solutions for n=5
..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0
..0..1..0..1..1. .0..0..0..0..1. .1..0..1..0..0. .0..1..1..1..1
..0..1..1..0..0. .1..1..1..1..0. .0..1..1..1..0. .0..1..1..1..0
..1..0..1..0..1. .0..0..1..0..1. .0..1..1..1..0. .0..0..1..0..0
..0..1..1..1..0. .1..1..1..1..1. .0..0..1..0..0. .0..1..1..0..0
CROSSREFS
Cf. A303102.
Sequence in context: A183961 A250328 A306432 * A324307 A065993 A097802
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 18 2018
STATUS
approved