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A316642
Number of nXn 0..1 arrays with every element unequal to 1, 2, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.
0
0, 3, 15, 42, 3988, 43604, 1396674, 331807728, 22368384180, 4961341851222
OFFSET
1,2
COMMENTS
Diagonal of A316648.
EXAMPLE
Some solutions for n=5
..0..1..0..0..1. .0..1..1..0..0. .0..0..0..0..0. .0..0..1..1..1
..0..0..0..1..0. .0..0..0..0..1. .1..0..0..1..0. .1..1..1..0..1
..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .1..1..1..1..1
..1..0..0..0..1. .0..1..0..0..1. .1..0..0..0..1. .0..1..0..1..1
..0..1..0..0..1. .0..0..0..1..0. .0..0..1..0..0. .1..0..0..0..0
CROSSREFS
Cf. A316648.
Sequence in context: A366576 A093627 A192060 * A146805 A147057 A330322
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 09 2018
STATUS
approved