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 A300462 #4 Mar 06 2018 11:27:25 %S A300462 0,9,22,142,1146,7456,55663,400028,2906875,21162204,153677233, %T A300462 1117612488,8123629685,59057261422,429317113075,3120977422852, %U A300462 22688267741133,164934718709179,1199012026918226,8716348960310287,63364478025520501 %N A300462 Number of nX5 0..1 arrays with every element equal to 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. %C A300462 Column 5 of A300465. %H A300462 R. H. Hardin, <a href="/A300462/b300462.txt">Table of n, a(n) for n = 1..210</a> %e A300462 Some solutions for n=5 %e A300462 ..0..0..0..1..1. .0..0..0..0..0. .0..0..1..0..0. .0..0..1..1..0 %e A300462 ..0..0..1..1..0. .0..1..0..0..1. .0..1..1..0..0. .0..0..1..0..0 %e A300462 ..1..1..0..0..0. .1..1..0..1..1. .1..1..1..0..0. .0..0..1..1..1 %e A300462 ..1..0..1..1..1. .1..1..0..1..1. .0..0..1..1..1. .0..1..1..1..0 %e A300462 ..0..0..1..1..1. .1..0..0..1..1. .0..1..1..1..1. .0..0..0..0..0 %Y A300462 Cf. A300465. %K A300462 nonn %O A300462 1,2 %A A300462 _R. H. Hardin_, Mar 06 2018