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Number of n X n 0..1 arrays with no 1 equal to more than two of its horizontal, vertical and antidiagonal neighbors.
0

%I #6 Apr 26 2020 20:42:44

%S 2,15,287,18320,3455416,1974531630,3418770498783,17870966063289283,

%T 282553643923249045737,13505171096689643652228930,

%U 1951495960309987636340762968396

%N Number of n X n 0..1 arrays with no 1 equal to more than two of its horizontal, vertical and antidiagonal neighbors.

%C Diagonal of A283282.

%e Some solutions for n=4

%e ..1..1..0..0. .0..1..0..0. .0..1..0..1. .0..0..1..0. .1..0..1..1

%e ..0..0..1..0. .1..0..0..1. .0..1..0..0. .1..0..0..1. .1..0..0..1

%e ..0..0..0..1. .0..1..0..0. .0..1..0..1. .0..1..0..0. .0..1..0..1

%e ..0..0..1..0. .0..0..1..0. .0..0..1..0. .0..1..1..1. .0..0..1..0

%Y Cf. A283282.

%K nonn

%O 1,1

%A _R. H. Hardin_, Mar 04 2017