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A316616
Number of nXn 0..1 arrays with every element unequal to 0, 2, 3, 5, 7 or 8 king-move adjacent elements, with upper left element zero.
0
1, 4, 13, 26, 189, 1916, 20777, 476965, 16700783, 822198814
OFFSET
1,2
COMMENTS
Diagonal of A316620.
EXAMPLE
Some solutions for n=5
..0..1..1..0..0. .0..0..1..1..1. .0..1..0..1..0. .0..0..1..0..0
..1..0..1..0..0. .0..0..1..0..0. .0..1..1..1..1. .1..1..0..1..1
..0..1..0..0..0. .0..0..0..1..0. .0..0..1..0..1. .0..1..0..1..0
..0..0..1..0..0. .0..0..1..0..1. .0..1..1..0..1. .0..0..1..0..0
..1..1..1..0..0. .0..0..1..1..0. .1..0..0..1..0. .1..1..1..1..1
CROSSREFS
Cf. A316620.
Sequence in context: A304003 A305356 A304946 * A119652 A147875 A321988
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 08 2018
STATUS
approved