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 A302524 #4 Apr 09 2018 09:21:50 %S A302524 2,10,42,168,902,3256,15852,77904,314276,1506894,7035934,30537794, %T A302524 143024948,655833426,2937151450,13568476862,61920768478,280707441628, %U A302524 1287994621032,5873565899442,26746065104754,122342967545180 %N A302524 Number of nX4 0..1 arrays with every element equal to 1, 2, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302524 Column 4 of A302528. %H A302524 R. H. Hardin, <a href="/A302524/b302524.txt">Table of n, a(n) for n = 1..210</a> %H A302524 R. H. Hardin, <a href="/A302524/a302524.txt">Empirical recurrence of order 72</a> %F A302524 Empirical recurrence of order 72 (see link above) %e A302524 Some solutions for n=5 %e A302524 ..0..1..0..0. .0..0..1..0. .0..0..1..0. .0..1..1..1. .0..1..1..0 %e A302524 ..1..0..1..1. .1..1..0..1. .1..1..0..1. .1..0..0..0. .1..0..0..1 %e A302524 ..0..1..0..1. .0..0..0..0. .0..1..0..1. .0..1..0..1. .0..1..0..1 %e A302524 ..0..0..0..1. .0..0..1..0. .0..0..1..1. .0..1..1..1. .0..0..1..1 %e A302524 ..0..1..1..0. .1..1..0..1. .0..1..0..1. .1..0..0..0. .0..1..0..1 %Y A302524 Cf. A302528. %K A302524 nonn %O A302524 1,1 %A A302524 _R. H. Hardin_, Apr 09 2018