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 A302315 #4 Apr 05 2018 09:42:43 %S A302315 64,86,336,1090,3915,18990,76642,360898,1695748,9408402,50431855, %T A302315 270054791,1483688723,8638547369,49555516908,278416318505, %U A302315 1587868618303,9269491523649,53654294707162,306415770314870,1762671922872075 %N A302315 Number of 7Xn 0..1 arrays with every element equal to 0, 1, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302315 Row 7 of A302309. %H A302315 R. H. Hardin, <a href="/A302315/b302315.txt">Table of n, a(n) for n = 1..210</a> %e A302315 Some solutions for n=5 %e A302315 ..0..1..1..1..0. .0..1..0..1..0. .0..1..0..0..1. .0..1..0..1..0 %e A302315 ..0..1..0..1..0. .1..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0 %e A302315 ..0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0 %e A302315 ..0..1..0..1..0. .0..1..0..1..1. .0..1..0..1..0. .1..1..0..1..0 %e A302315 ..0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0 %e A302315 ..0..1..0..1..1. .0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0 %e A302315 ..1..0..0..1..0. .0..1..0..0..0. .0..1..0..0..1. .0..0..0..1..0 %Y A302315 Cf. A302309. %K A302315 nonn %O A302315 1,1 %A A302315 _R. H. Hardin_, Apr 05 2018