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 A295211 #4 Nov 17 2017 07:24:36 %S A295211 1,31,345,4938,85215,1245294,18444470,278238087,4170628296, %T A295211 62588525694,940255638767,14117945596996,211965773459470, %U A295211 3182555837979301,47783850148231569,717445698125438780,10772054909227440585 %N A295211 Number of nX6 0..1 arrays with each 1 horizontally or vertically adjacent to 2 or 3 1s. %C A295211 Column 6 of A295213. %H A295211 R. H. Hardin, <a href="/A295211/b295211.txt">Table of n, a(n) for n = 1..210</a> %e A295211 Some solutions for n=5 %e A295211 ..1..1..1..1..1..1. .1..1..1..1..1..1. .0..1..1..1..0..0. .1..1..0..0..0..0 %e A295211 ..1..1..1..1..0..1. .1..1..0..0..1..1. .0..1..0..1..1..0. .1..1..0..0..1..1 %e A295211 ..1..0..0..1..1..1. .1..1..0..1..1..1. .1..1..1..1..1..1. .0..0..1..1..1..1 %e A295211 ..1..1..1..1..1..0. .1..1..0..1..0..0. .1..0..0..0..0..1. .0..0..1..0..0..1 %e A295211 ..1..1..0..0..0..0. .0..1..1..1..0..0. .1..1..1..1..1..1. .0..0..1..1..1..1 %Y A295211 Cf. A295213. %K A295211 nonn %O A295211 1,2 %A A295211 _R. H. Hardin_, Nov 17 2017