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A317147
Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.
0
1, 4, 36, 416, 19580, 960577, 100639070, 24402104731, 9305062491337
OFFSET
1,2
COMMENTS
Diagonal of A317153.
EXAMPLE
Some solutions for n=5
..0..0..1..0..0. .0..0..0..1..0. .0..1..0..0..1. .0..1..0..1..0
..0..0..0..0..1. .0..0..0..1..0. .0..0..0..1..0. .0..0..0..0..0
..1..0..0..0..0. .1..0..0..0..0. .0..1..0..1..1. .0..0..0..0..0
..1..0..0..0..1. .0..0..0..1..0. .0..1..0..0..1. .1..0..0..1..1
..0..0..0..0..0. .0..0..0..1..0. .0..0..0..1..0. .1..0..0..1..1
CROSSREFS
Cf. A317153.
Sequence in context: A131765 A244559 A319175 * A371679 A132864 A294050
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 22 2018
STATUS
approved