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A299931
Number of n X n 0..1 arrays with every element equal to 1, 2, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.
0
0, 4, 130, 11212, 3441754, 3664429516, 13409569414628, 169221841691644190, 7363533504405087088605
OFFSET
1,2
COMMENTS
Diagonal of A299937.
EXAMPLE
Some solutions for n=5
..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..1. .0..0..0..0..0
..0..1..0..1..0. .0..1..0..1..0. .0..0..0..1..0. .0..0..0..1..1
..1..1..0..1..1. .1..0..1..0..0. .1..1..1..1..0. .1..1..1..0..1
..0..0..1..0..1. .1..1..0..1..0. .0..0..1..1..1. .0..0..1..1..0
..0..0..1..0..0. .1..0..1..1..1. .1..1..0..0..1. .0..0..0..1..0
CROSSREFS
Cf. A299937.
Sequence in context: A050284 A096759 A299367 * A006103 A209012 A376870
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 22 2018
STATUS
approved