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A283685
Number of n X n 0..1 arrays with no 1 equal to more than two of its horizontal, diagonal and antidiagonal neighbors.
0
2, 16, 264, 15226, 2530461, 1119189256, 1496646288297, 5725555721739395, 62058786307229208212, 1952915013418224842868823, 176329484983538571638638096503
OFFSET
1,1
COMMENTS
Diagonal of A283691.
EXAMPLE
Some solutions for n=4
..1..0..1..0. .1..0..0..0. .0..0..0..1. .1..1..0..0. .0..0..1..0
..1..0..0..1. .0..1..0..1. .0..1..0..0. .1..1..0..0. .0..1..0..1
..0..0..0..0. .0..0..0..1. .0..0..0..1. .0..0..0..1. .0..1..0..1
..1..0..1..0. .0..0..1..1. .0..0..0..0. .0..0..1..0. .1..0..0..0
CROSSREFS
Cf. A283691.
Sequence in context: A351918 A326272 A372513 * A197458 A050974 A012188
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 14 2017
STATUS
approved