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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.

A302723 Number of n X n 0..1 arrays with every element equal to 1, 2, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

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%I A302723 #6 Sep 16 2020 18:58:28
%S A302723 0,3,22,89,1307,20842,532511,17200486,683140749,61552556640
%N A302723 Number of n X n 0..1 arrays with every element equal to 1, 2, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
%C A302723 Diagonal of A302728.
%e A302723 Some solutions for n=5
%e A302723 ..0..1..0..0..1. .0..0..1..1..1. .0..1..0..1..1. .0..1..1..1..0
%e A302723 ..0..0..1..1..0. .1..1..1..0..1. .1..0..0..0..1. .1..0..0..0..1
%e A302723 ..0..0..1..0..1. .1..0..0..0..1. .0..1..1..1..1. .1..1..1..1..1
%e A302723 ..1..1..1..0..1. .1..0..1..1..1. .1..1..1..1..0. .1..1..0..1..1
%e A302723 ..1..0..0..1..0. .1..1..1..0..0. .0..0..1..0..0. .0..0..1..0..0
%Y A302723 Cf. A302728.
%K A302723 nonn
%O A302723 1,2
%A A302723 _R. H. Hardin_, Apr 12 2018

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