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A316577
Number of nXn 0..1 arrays with every element unequal to 1, 2, 3, 4, 7 or 8 king-move adjacent elements, with upper left element zero.
0
0, 7, 63, 2477, 130212, 15492767, 4227286531, 2151886485463, 2515639556772307
OFFSET
1,2
COMMENTS
Diagonal of A316583.
EXAMPLE
Some solutions for n=5
..0..1..1..0..0. .0..1..1..0..0. .0..1..0..0..1. .0..0..1..1..1
..0..1..1..1..1. .0..1..0..1..1. .0..0..1..0..1. .1..1..1..0..1
..0..1..1..0..0. .0..1..1..1..1. .1..0..0..0..0. .0..1..1..1..0
..1..1..0..0..0. .1..1..1..0..1. .0..1..0..0..0. .0..0..0..0..1
..1..0..1..0..1. .0..1..1..1..0. .1..1..1..0..1. .1..1..0..0..0
CROSSREFS
Cf. A316583.
Sequence in context: A345383 A126883 A137810 * A036287 A116231 A195630
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 07 2018
STATUS
approved