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 A304007 #4 May 04 2018 11:20:40 %S A304007 1,26,27,64,137,271,655,1412,3245,7809,17290,40682,93292,216048, %T A304007 499755,1162587,2685521,6238096,14489376,33631721,78120529,181638185, %U A304007 422198419,981730209,2284138522,5314049218,12366970040,28787274304,67017999388 %N A304007 Number of nX5 0..1 arrays with every element unequal to 0, 2, 3 or 5 king-move adjacent elements, with upper left element zero. %C A304007 Column 5 of A304010. %H A304007 R. H. Hardin, <a href="/A304007/b304007.txt">Table of n, a(n) for n = 1..210</a> %e A304007 Some solutions for n=5 %e A304007 ..0..0..0..0..0. .0..0..0..1..1. .0..1..0..1..0. .0..0..1..1..1 %e A304007 ..1..1..0..1..1. .1..1..1..0..0. .0..1..1..1..0. .1..1..0..0..0 %e A304007 ..0..1..1..1..0. .0..1..0..0..0. .0..0..1..0..0. .1..0..0..0..0 %e A304007 ..1..1..0..1..1. .1..1..0..1..1. .0..1..1..1..0. .0..0..0..1..1 %e A304007 ..0..0..0..0..0. .0..0..1..1..0. .0..1..0..1..0. .1..0..1..1..0 %Y A304007 Cf. A304010. %K A304007 nonn %O A304007 1,2 %A A304007 _R. H. Hardin_, May 04 2018