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 A283041 #4 Feb 27 2017 09:00:46 %S A283041 26,3232,175963,8912378,414085368,18455711930,797350288363, %T A283041 33705434438284,1401215705047092,57496998569457406, %U A283041 2334654228770351159,93982808773859979206,3756077506881552506247,149195064747909416762172 %N A283041 Number of nX7 0..1 arrays with no 1 equal to more than one of its horizontal and vertical neighbors, with the exception of exactly one element. %C A283041 Column 7 of A283042. %H A283041 R. H. Hardin, <a href="/A283041/b283041.txt">Table of n, a(n) for n = 1..210</a> %e A283041 Some solutions for n=3 %e A283041 ..0..1..0..1..0..1..0. .0..0..0..1..0..0..1. .0..1..1..0..0..0..0 %e A283041 ..0..1..1..0..1..0..1. .1..1..0..0..0..1..0. .0..1..0..0..0..0..0 %e A283041 ..0..0..0..0..1..0..0. .0..0..1..0..1..1..1. .0..0..0..1..1..0..1 %Y A283041 Cf. A283042. %K A283041 nonn %O A283041 1,1 %A A283041 _R. H. Hardin_, Feb 27 2017