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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.

A301602 Number of n X n 0..1 arrays with every element equal to 0, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.

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%I A301602 #6 Aug 20 2020 11:46:01
%S A301602 1,2,2,25,330,8888,591585,83224304,23865691820,14092825824108
%N A301602 Number of n X n 0..1 arrays with every element equal to 0, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.
%C A301602 Diagonal of A301608.
%e A301602 Some solutions for n=5
%e A301602 ..0..0..1..1..1. .0..0..1..1..1. .0..1..1..1..0. .0..0..1..1..1
%e A301602 ..0..0..1..0..1. .0..0..1..0..1. .1..1..0..1..1. .0..0..1..1..1
%e A301602 ..0..0..1..1..1. .0..0..1..1..1. .1..0..1..1..1. .1..1..1..0..1
%e A301602 ..1..1..0..1..1. .1..1..0..0..0. .1..1..1..0..1. .1..1..0..1..1
%e A301602 ..1..1..1..1..1. .1..1..0..0..0. .0..1..1..1..1. .1..1..1..1..0
%Y A301602 Cf. A301608.
%K A301602 nonn
%O A301602 1,2
%A A301602 _R. H. Hardin_, Mar 24 2018

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