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 A302731 #4 Apr 12 2018 10:56:37 %S A302731 0,162,1079,941,4491,20842,89121,286746,1022779,4520360,18491493, %T A302731 67714259,259145846,1045498404,4177884352,16077695845,62395241080, %U A302731 246809269806,974367008077,3802389262429,14855944546521,58398777429077 %N A302731 Number of 6Xn 0..1 arrays with every element equal to 1, 2, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302731 Row 6 of A302728. %H A302731 R. H. Hardin, <a href="/A302731/b302731.txt">Table of n, a(n) for n = 1..210</a> %e A302731 Some solutions for n=5 %e A302731 ..0..0..1..0..0. .0..1..0..1..0. .0..0..0..1..1. .0..1..0..0..0 %e A302731 ..0..1..1..1..0. .1..0..1..0..1. .0..1..0..0..1. .1..0..0..1..0 %e A302731 ..1..0..1..0..1. .0..0..0..0..0. .1..1..0..1..0. .0..0..1..0..1 %e A302731 ..1..0..1..0..1. .0..1..0..1..0. .0..0..0..1..0. .1..1..1..0..1 %e A302731 ..1..1..0..1..1. .1..0..1..0..1. .1..1..0..0..1. .1..0..0..1..0 %e A302731 ..0..0..1..0..0. .0..0..0..0..0. .0..0..1..0..0. .0..0..1..0..1 %Y A302731 Cf. A302728. %K A302731 nonn %O A302731 1,2 %A A302731 _R. H. Hardin_, Apr 12 2018