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A283275
Number of n X n 0..1 arrays with no 1 equal to more than two of its horizontal, vertical and antidiagonal neighbors.
0
2, 15, 287, 18320, 3455416, 1974531630, 3418770498783, 17870966063289283, 282553643923249045737, 13505171096689643652228930, 1951495960309987636340762968396
OFFSET
1,1
COMMENTS
Diagonal of A283282.
EXAMPLE
Some solutions for n=4
..1..1..0..0. .0..1..0..0. .0..1..0..1. .0..0..1..0. .1..0..1..1
..0..0..1..0. .1..0..0..1. .0..1..0..0. .1..0..0..1. .1..0..0..1
..0..0..0..1. .0..1..0..0. .0..1..0..1. .0..1..0..0. .0..1..0..1
..0..0..1..0. .0..0..1..0. .0..0..1..0. .0..1..1..1. .0..0..1..0
CROSSREFS
Cf. A283282.
Sequence in context: A076111 A371673 A087526 * A372312 A264703 A262961
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 04 2017
STATUS
approved