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 A302221 #6 Oct 30 2022 15:40:55 %S A302221 3,146,760,6110,40395,292781,2043848,14419536,101511446,713030990, %T A302221 5019470018,35283108018,248180957058,1745222920651,12274305388046, %U A302221 86321053540385,607085317234430,4269538885720366,30026989609915629 %N A302221 Number of n X 5 0..1 arrays with every element equal to 1, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302221 Column 5 of A302224. %H A302221 R. H. Hardin, <a href="/A302221/b302221.txt">Table of n, a(n) for n = 1..210</a> %H A302221 R. H. Hardin, <a href="/A302221/a302221.txt">Empirical recurrence of order 92</a> %F A302221 Empirical recurrence of order 92 (see link above). %e A302221 Some solutions for n=5 %e A302221 ..0..0..1..0..0. .0..1..1..1..0. .0..0..1..1..1. .0..0..1..0..0 %e A302221 ..0..1..1..0..0. .1..0..0..0..1. .1..1..0..0..1. .0..1..0..1..1 %e A302221 ..1..0..0..1..1. .0..0..1..1..1. .0..0..0..1..1. .1..1..0..0..1 %e A302221 ..1..1..0..0..1. .1..0..0..1..0. .1..1..1..1..0. .1..0..1..1..0 %e A302221 ..0..0..1..1..1. .0..1..1..0..0. .1..0..0..0..1. .1..1..0..0..0 %Y A302221 Cf. A302224. %K A302221 nonn %O A302221 1,1 %A A302221 _R. H. Hardin_, Apr 03 2018