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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.

A302303 Number of n X n 0..1 arrays with every element equal to 0, 1, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

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%I A302303 #6 Aug 20 2020 11:51:34
%S A302303 1,3,13,66,445,5715,76642,2150420,124691962,17216491876
%N A302303 Number of n X n 0..1 arrays with every element equal to 0, 1, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
%C A302303 Diagonal of A302309.
%e A302303 Some solutions for n=5
%e A302303 ..0..1..0..0..1. .0..1..0..0..1. .0..0..1..0..1. .0..1..0..1..1
%e A302303 ..1..1..0..1..0. .0..1..0..1..0. .1..1..1..0..0. .0..1..1..0..1
%e A302303 ..0..1..0..1..0. .0..1..0..1..0. .0..0..0..0..0. .1..0..1..0..1
%e A302303 ..0..1..0..1..1. .0..1..0..1..0. .0..1..0..0..1. .1..0..1..0..1
%e A302303 ..1..0..0..1..0. .0..0..0..1..0. .0..1..1..1..1. .1..0..1..0..1
%Y A302303 Cf. A302309.
%K A302303 nonn
%O A302303 1,2
%A A302303 _R. H. Hardin_, Apr 05 2018

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