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A317211
Number of nXn 0..1 arrays with every element unequal to 0, 2, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.
0
1, 4, 23, 959, 127358, 53479785, 66735041323, 247944910114486, 2724578446333546605
OFFSET
1,2
COMMENTS
Diagonal of A317215.
EXAMPLE
Some solutions for n=5
..0..0..1..1..1. .0..1..1..1..0. .0..0..0..1..0. .0..0..1..0..1
..1..1..0..0..0. .0..1..1..1..0. .1..1..1..1..0. .1..1..0..0..1
..0..0..1..0..0. .1..0..1..0..0. .1..0..0..1..0. .0..0..1..0..0
..0..1..1..1..1. .0..1..0..1..1. .1..0..0..1..1. .1..0..0..0..1
..0..1..0..0..0. .1..0..1..0..0. .1..0..1..1..0. .1..0..1..0..1
CROSSREFS
Cf. A317215.
Sequence in context: A304413 A316240 A305948 * A145514 A305665 A319145
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 23 2018
STATUS
approved