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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.

A302218 Number of n X n 0..1 arrays with every element equal to 1, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

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%I A302218 #6 Aug 20 2020 11:50:35
%S A302218 0,3,43,934,40395,3420704,553097760,177191137344,102914156897887,
%T A302218 122108799039662692
%N A302218 Number of n X n 0..1 arrays with every element equal to 1, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
%C A302218 Diagonal of A302224.
%e A302218 Some solutions for n=5
%e A302218 ..0..0..0..0..0. .0..0..0..0..0. .0..0..1..1..0. .0..0..0..1..1
%e A302218 ..1..1..1..1..1. .1..1..0..0..1. .1..1..1..0..1. .1..0..1..0..1
%e A302218 ..1..0..0..0..1. .1..1..1..1..1. .0..0..0..1..0. .0..1..1..0..0
%e A302218 ..0..1..1..1..0. .0..0..0..0..0. .1..1..0..1..1. .0..0..0..1..0
%e A302218 ..1..0..0..0..0. .0..1..1..1..0. .0..0..1..1..1. .1..1..1..1..1
%Y A302218 Cf. A302224.
%K A302218 nonn
%O A302218 1,2
%A A302218 _R. H. Hardin_, Apr 03 2018

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