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 A296950 #4 Dec 22 2017 11:08:51 %S A296950 9,256,1765,17450,256713,2640993,29067775,356242817,4007327435, %T A296950 45579824373,533089787086,6110543663491,70142323962609, %U A296950 810920084478849,9331277910756214,107381182592973180,1237942191372084761 %N A296950 Number of nX6 0..1 arrays with each 1 adjacent to 1, 3 or 5 king-move neighboring 1s. %C A296950 Column 6 of A296952. %H A296950 R. H. Hardin, <a href="/A296950/b296950.txt">Table of n, a(n) for n = 1..210</a> %e A296950 Some solutions for n=4 %e A296950 ..0..1..0..0..0..0. .1..0..1..1..1..0. .0..0..0..0..0..0. .0..0..0..0..0..1 %e A296950 ..1..0..0..1..1..0. .0..1..1..0..0..0. .0..0..1..0..1..0. .1..0..0..0..0..1 %e A296950 ..0..0..0..0..0..0. .0..1..1..0..0..0. .0..0..0..1..0..0. .0..1..1..1..0..0 %e A296950 ..0..0..0..0..0..0. .0..0..0..0..0..0. .1..1..0..1..0..0. .0..0..1..0..1..0 %Y A296950 Cf. A296952. %K A296950 nonn %O A296950 1,1 %A A296950 _R. H. Hardin_, Dec 22 2017