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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A283566 Number of n X n 0..1 arrays with no 1 equal to more than one of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly one element.

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%I A283566 #6 Apr 26 2020 20:44:20
%S A283566 0,4,169,6812,945100,226897932,129997769458,172466774677716,
%T A283566 522509795096193625,3748613500011644923440,62982260120608888164984371
%N A283566 Number of n X n 0..1 arrays with no 1 equal to more than one of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly one element.
%C A283566 Diagonal of A283572.
%e A283566 Some solutions for n=4
%e A283566 ..1..1..1..0. .0..1..0..1. .1..0..0..0. .0..1..0..0. .1..0..1..0
%e A283566 ..1..0..0..0. .0..1..0..1. .0..0..0..0. .1..0..1..0. .1..0..1..0
%e A283566 ..1..0..1..1. .0..0..1..0. .0..1..0..0. .1..0..1..0. .1..0..1..0
%e A283566 ..0..0..0..0. .0..1..0..0. .1..1..0..0. .0..0..1..0. .0..1..0..0
%Y A283566 Cf. A283572.
%K A283566 nonn
%O A283566 1,2
%A A283566 _R. H. Hardin_, Mar 11 2017

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