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A304466
Number of n X n 0..1 arrays with every element unequal to 0, 1, 2, 3 or 6 king-move adjacent elements, with upper left element zero.
0
1, 8, 41, 322, 5063, 89071, 1802240, 101407827, 8813328376, 823379005870
OFFSET
1,2
COMMENTS
Diagonal of A304472.
EXAMPLE
Some solutions for n=5
..0..0..0..0..0. .0..1..1..1..1. .0..0..1..1..0. .0..1..1..1..1
..0..0..0..0..0. .0..1..1..1..1. .0..1..1..0..0. .0..0..1..1..1
..0..0..0..1..0. .0..1..1..1..1. .1..1..1..1..1. .1..1..1..1..1
..0..0..0..1..1. .0..1..1..1..1. .1..1..0..1..1. .1..1..1..0..0
..1..0..0..0..0. .0..1..1..1..0. .0..1..0..0..1. .1..1..1..1..0
CROSSREFS
Cf. A304472.
Sequence in context: A188209 A026953 A280068 * A228480 A067301 A295936
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 13 2018
STATUS
approved