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 A301447 #4 Mar 21 2018 11:54:27 %S A301447 16,401,5930,91370,1423344,22207589,346263718,5399605493,84198470831, %T A301447 1312961721912,20473797385819,319260349892947,4978419327889986, %U A301447 77631501971204037,1210554922385559732,18876914499872038074 %N A301447 Number of nX5 0..1 arrays with every element equal to 0, 1, 2, 3, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. %C A301447 Column 5 of A301450. %H A301447 R. H. Hardin, <a href="/A301447/b301447.txt">Table of n, a(n) for n = 1..210</a> %e A301447 Some solutions for n=5 %e A301447 ..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0 %e A301447 ..0..1..1..1..1. .1..1..1..1..0. .0..1..0..1..1. .1..1..0..1..0 %e A301447 ..1..0..1..0..1. .0..0..0..1..0. .1..1..0..1..1. .1..1..0..0..1 %e A301447 ..1..0..0..1..1. .1..1..1..1..0. .0..1..0..0..0. .0..0..1..1..0 %e A301447 ..1..1..0..1..0. .0..0..0..1..0. .1..0..1..0..1. .1..1..0..0..0 %Y A301447 Cf. A301450. %K A301447 nonn %O A301447 1,1 %A A301447 _R. H. Hardin_, Mar 21 2018