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.
%I A301444 #6 Aug 20 2020 11:43:50 %S A301444 1,8,171,9541,1423344,564002959,592006690060,1646995545166039, %T A301444 12145346382857661327,237428255410557186948107 %N A301444 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 3, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. %C A301444 Diagonal of A301450. %e A301444 Some solutions for n=5 %e A301444 ..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..1. .0..0..0..0..1 %e A301444 ..1..1..1..1..0. .0..1..1..1..0. .1..0..1..0..0. .1..1..0..0..0 %e A301444 ..0..0..0..1..1. .0..0..1..1..1. .0..1..0..1..1. .0..1..1..1..1 %e A301444 ..1..0..0..1..1. .0..1..1..1..0. .1..0..1..0..1. .1..0..1..0..1 %e A301444 ..0..0..1..1..0. .0..0..1..1..0. .1..0..0..0..1. .0..0..0..0..1 %Y A301444 Cf. A301450. %K A301444 nonn %O A301444 1,2 %A A301444 _R. H. Hardin_, Mar 21 2018