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 A301397 #4 Mar 20 2018 11:00:23 %S A301397 0,9,44,446,4857,49325,521514,5457161,57311190,601654211,6316448607, %T A301397 66317193844,696258824443,7310037380326,76748138985060, %U A301397 805779765484701,8459893652740792,88820547809627099,932528264893178568 %N A301397 Number of nX5 0..1 arrays with every element equal to 2, 3, 4, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. %C A301397 Column 5 of A301400. %H A301397 R. H. Hardin, <a href="/A301397/b301397.txt">Table of n, a(n) for n = 1..210</a> %e A301397 Some solutions for n=5 %e A301397 ..0..0..1..1..1. .0..0..0..0..1. .0..0..1..1..1. .0..0..0..0..0 %e A301397 ..0..1..0..1..1. .0..1..0..1..1. .0..1..1..1..0. .0..0..1..0..1 %e A301397 ..1..0..0..1..0. .1..1..1..1..1. .0..0..0..0..0. .1..1..1..1..1 %e A301397 ..1..1..0..0..0. .1..1..0..0..1. .0..1..1..0..0. .1..0..0..1..1 %e A301397 ..1..1..0..0..0. .1..0..0..1..1. .1..1..1..0..0. .0..0..1..1..1 %Y A301397 Cf. A301400. %K A301397 nonn %O A301397 1,2 %A A301397 _R. H. Hardin_, Mar 20 2018