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A283851
Number of n X n 0..1 arrays with no 1 equal to more than three of its horizontal, diagonal and antidiagonal neighbors.
0
2, 16, 409, 35373, 10741381, 10634931992, 35481195059121, 402875332003637009, 15356708293578353570000, 1967963796346049662173630851, 850722520813357296311553404161550
OFFSET
1,1
COMMENTS
Diagonal of A283857.
EXAMPLE
Some solutions for n=4
..1..1..0..1. .0..1..0..1. .1..0..1..0. .0..1..0..1. .0..0..1..0
..1..0..1..1. .1..0..0..1. .0..0..0..0. .1..0..0..1. .1..0..0..0
..0..0..0..0. .0..1..1..0. .0..0..0..1. .0..0..0..1. .0..0..1..0
..0..0..1..0. .0..0..0..1. .1..1..1..1. .1..0..1..1. .0..1..0..1
CROSSREFS
Cf. A283857.
Sequence in context: A189104 A347914 A181213 * A130276 A027871 A283408
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 17 2017
STATUS
approved