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 A303420 #4 Apr 23 2018 10:54:24 %S A303420 64,8192,972168,116517744,13963574592,1673186560760,200493397340704, %T A303420 24024569786901184,2878797172114538576,344958245288471965824, %U A303420 41335385495979014696632,4953104083775431293635528 %N A303420 Number of nX7 0..1 arrays with every element equal to 0, 1, 2, 3, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A303420 Column 7 of A303421. %H A303420 R. H. Hardin, <a href="/A303420/b303420.txt">Table of n, a(n) for n = 1..210</a> %H A303420 R. H. Hardin, <a href="/A303420/a303420.txt">Empirical recurrence of order 58</a> %F A303420 Empirical recurrence of order 58 (see link above) %e A303420 Some solutions for n=5 %e A303420 ..0..0..0..0..0..0..0. .0..0..0..0..0..1..1. .0..0..0..0..1..0..0 %e A303420 ..0..0..0..0..1..1..1. .0..0..0..1..1..1..1. .0..0..0..1..0..1..1 %e A303420 ..0..0..1..1..0..0..1. .0..0..1..0..0..0..1. .0..0..1..0..0..1..1 %e A303420 ..0..0..0..0..0..1..1. .0..0..0..0..0..1..1. .0..0..0..0..0..1..1 %e A303420 ..0..0..0..0..0..0..0. .0..0..0..1..1..1..1. .0..0..0..1..1..1..0 %Y A303420 Cf. A303421. %K A303420 nonn %O A303420 1,1 %A A303420 _R. H. Hardin_, Apr 23 2018