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A304303
Number of n X n 0..1 arrays with every element unequal to 0, 1, 2, 3 or 5 king-move adjacent elements, with upper left element zero.
0
1, 8, 77, 1137, 26548, 989406, 55773947, 4882896349, 654105710575
OFFSET
1,2
COMMENTS
Diagonal of A304310.
EXAMPLE
Some solutions for n=5
..0..0..1..1..1. .0..1..1..0..0. .0..1..0..0..0. .0..0..0..1..1
..0..1..1..1..0. .0..1..1..1..0. .1..1..0..0..1. .0..0..1..1..1
..1..1..1..1..1. .0..1..1..0..0. .1..0..0..0..0. .0..1..1..1..1
..0..1..1..0..0. .0..0..0..1..1. .0..0..0..1..1. .1..1..1..1..1
..0..0..1..0..0. .0..0..0..0..1. .1..0..1..1..0. .1..1..1..1..0
CROSSREFS
Cf. A304310.
Sequence in context: A187638 A092661 A196071 * A074841 A272208 A136954
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 10 2018
STATUS
approved