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 A296949 #4 Dec 22 2017 11:08:01 %S A296949 6,112,544,3637,37179,256713,1898178,16087936,121741279,933686077, %T A296949 7473862911,57912910897,449682762989,3538407928642,27585262869841, %U A296949 215073549972468,1683740352779281,13146690679835447,102637633797615262 %N A296949 Number of nX5 0..1 arrays with each 1 adjacent to 1, 3 or 5 king-move neighboring 1s. %C A296949 Column 5 of A296952. %H A296949 R. H. Hardin, <a href="/A296949/b296949.txt">Table of n, a(n) for n = 1..210</a> %e A296949 Some solutions for n=5 %e A296949 ..1..1..1..0..1. .0..1..0..1..0. .0..0..1..0..1. .1..1..0..0..1 %e A296949 ..0..0..1..1..0. .0..0..1..0..0. .1..0..1..0..1. .0..0..0..1..0 %e A296949 ..0..0..0..0..0. .0..1..0..0..0. .1..0..0..0..0. .0..0..0..0..0 %e A296949 ..0..0..1..1..1. .0..0..0..0..1. .0..0..0..1..1. .0..1..0..1..1 %e A296949 ..0..0..1..1..1. .1..1..0..1..0. .0..0..0..0..0. .1..0..0..0..0 %Y A296949 Cf. A296952. %K A296949 nonn %O A296949 1,1 %A A296949 _R. H. Hardin_, Dec 22 2017