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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.

A303034 Number of n X n 0..1 arrays with every element equal to 0, 1, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

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%I A303034 #6 Sep 16 2020 19:01:56
%S A303034 1,3,14,74,703,13597,345668,13840842,1107624272,184266124741
%N A303034 Number of n X n 0..1 arrays with every element equal to 0, 1, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
%C A303034 Diagonal of A303040.
%e A303034 Some solutions for n=5
%e A303034 ..0..0..0..1..0. .0..1..1..1..0. .0..1..0..0..0. .0..0..1..1..0
%e A303034 ..0..1..0..1..0. .1..1..1..1..1. .0..1..1..1..0. .0..1..0..1..0
%e A303034 ..0..1..0..1..0. .1..1..0..1..1. .1..0..1..1..1. .0..1..0..1..0
%e A303034 ..0..1..0..1..0. .0..1..0..1..0. .0..0..0..1..0. .0..1..0..1..0
%e A303034 ..0..1..1..0..0. .0..1..0..1..0. .1..0..0..0..1. .0..1..0..0..0
%Y A303034 Cf. A303040.
%K A303034 nonn
%O A303034 1,2
%A A303034 _R. H. Hardin_, Apr 17 2018

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