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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.

A300770 Number of n X n 0..1 arrays with every element equal to 2, 3, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

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%I A300770 #6 Aug 20 2020 11:39:05
%S A300770 0,1,3,36,1536,116954,27354464,16992197390,27071152148341,
%T A300770 112124137590207769
%N A300770 Number of n X n 0..1 arrays with every element equal to 2, 3, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
%C A300770 Diagonal of A300776.
%e A300770 Some solutions for n=5
%e A300770 ..0..0..1..1..1. .0..0..0..1..1. .0..0..0..0..0. .0..0..0..0..0
%e A300770 ..0..0..1..1..0. .0..0..1..1..1. .0..1..1..1..0. .0..1..0..0..1
%e A300770 ..1..1..0..0..0. .1..1..0..0..1. .1..1..1..0..0. .1..1..0..1..1
%e A300770 ..1..1..0..1..1. .1..1..0..1..0. .1..1..0..1..1. .0..0..1..1..0
%e A300770 ..1..1..1..1..1. .1..1..1..0..0. .1..0..0..1..1. .0..1..1..0..0
%Y A300770 Cf. A300776.
%K A300770 nonn
%O A300770 1,3
%A A300770 _R. H. Hardin_, Mar 12 2018

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