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 A303411 #4 Apr 23 2018 10:42:41 %S A303411 0,23,119,168,547,2079,6322,17903,53665,177334,555813,1667489,5141358, %T A303411 16219859,50536643,155427826,481370601,1501569819,4667505936, %U A303411 14454412939,44845109069,139426950850,433097541907,1343835090319,4171764326604 %N A303411 Number of 4Xn 0..1 arrays with every element equal to 1, 2, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A303411 Row 4 of A303410. %H A303411 R. H. Hardin, <a href="/A303411/b303411.txt">Table of n, a(n) for n = 1..210</a> %H A303411 R. H. Hardin, <a href="/A303411/a303411.txt">Empirical recurrence of order 71</a> %F A303411 Empirical recurrence of order 71 (see link above) %e A303411 Some solutions for n=5 %e A303411 ..0..0..1..0..0. .0..0..0..1..1. .0..0..0..1..1. .0..1..0..1..1 %e A303411 ..1..0..1..1..1. .0..1..0..1..1. .0..1..0..1..0. .0..0..1..0..0 %e A303411 ..1..1..0..0..1. .1..1..0..0..0. .1..1..0..0..0. .0..1..1..1..1 %e A303411 ..1..1..0..1..1. .0..0..1..1..0. .1..0..0..1..1. .1..0..1..0..0 %Y A303411 Cf. A303410. %K A303411 nonn %O A303411 1,2 %A A303411 _R. H. Hardin_, Apr 23 2018