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 A302063 #7 Apr 20 2020 00:04:27 %S A302063 1,8,148,7070,807601,230634314,163660519064,287524499258589, %T A302063 1255489680741501583,13604053305283669077460, %U A302063 365895359118873240818539121,24430548564295449443919121195475,4049114247665544928116295437330272275 %N A302063 Number of n X n 0..1 arrays with every element equal to 0, 1, 2 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero. %C A302063 Diagonal of A302069. %H A302063 R. H. Hardin, <a href="/A302063/b302063.txt">Table of n, a(n) for n = 1..16</a> %e A302063 Some solutions for n=5 %e A302063 ..0..0..0..1..0. .0..0..0..1..1. .0..0..0..1..0. .0..0..0..1..1 %e A302063 ..1..1..1..0..1. .1..0..1..1..0. .1..1..0..0..0. .1..1..0..0..1 %e A302063 ..0..0..1..1..0. .1..0..0..1..1. .1..1..0..0..0. .0..0..1..0..0 %e A302063 ..1..0..0..0..1. .1..1..0..0..1. .0..1..0..0..0. .1..0..1..0..1 %e A302063 ..1..1..1..0..0. .0..1..1..1..0. .0..1..0..1..0. .0..1..1..0..1 %Y A302063 Cf. A302069. %K A302063 nonn %O A302063 1,2 %A A302063 _R. H. Hardin_, Mar 31 2018