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A300169
Number of n X n 0..1 arrays with every element equal to 2, 3, 4, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.
0
0, 1, 9, 268, 50419, 30129628, 73267622156, 659976048146316, 22262408061891336825, 2806394212540208168079006
OFFSET
1,3
COMMENTS
Diagonal of A300175.
EXAMPLE
Some solutions for n=5
..0..0..0..0..0. .0..0..0..0..0. .0..0..1..1..1. .0..0..0..1..1
..0..1..1..1..0. .0..0..1..0..0. .0..0..1..1..1. .0..1..1..0..1
..1..1..0..1..1. .1..1..1..0..0. .0..0..0..0..1. .1..1..1..1..0
..1..0..1..0..1. .1..0..1..1..0. .0..1..0..1..0. .1..1..1..0..0
..0..0..0..1..1. .0..0..1..0..0. .1..1..1..0..0. .1..1..0..0..0
CROSSREFS
Cf. A300175.
Sequence in context: A191960 A168600 A088672 * A157571 A202689 A364438
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 27 2018
STATUS
approved