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 A296539 #6 Jun 26 2022 19:45:59 %S A296539 1,26,254,1554,10734,78660,560942,3987615,28515358,203892406, %T A296539 1456644769,10408749868,74388848144,531625780268,3799304215218, %U A296539 27152396258135,194049997801018,1386817640950191,9911186585406690,70832453927754955 %N A296539 Number of n X 6 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 2 or 4 neighboring 1's. %C A296539 Column 6 of A296541. %H A296539 R. H. Hardin, <a href="/A296539/b296539.txt">Table of n, a(n) for n = 1..210</a> %e A296539 Some solutions for n=6 %e A296539 ..1..1..0..0..1..0. .0..1..1..1..1..0. .0..0..1..1..1..0. .0..0..1..1..1..1 %e A296539 ..1..0..0..1..1..0. .0..1..1..1..0..0. .0..0..1..1..0..0. .0..1..0..0..0..1 %e A296539 ..0..1..0..0..0..0. .1..0..0..1..0..1. .1..1..0..1..0..0. .1..0..0..0..1..0 %e A296539 ..1..1..0..0..1..1. .1..0..0..1..1..1. .1..1..0..1..1..0. .1..1..0..1..0..0 %e A296539 ..0..0..1..0..1..0. .1..1..1..1..0..0. .1..1..1..1..0..1. .0..1..0..1..0..1 %e A296539 ..0..1..1..0..0..0. .0..0..1..0..0..0. .1..0..1..0..1..1. .0..1..1..0..1..1 %Y A296539 Cf. A296541. %K A296539 nonn %O A296539 1,2 %A A296539 _R. H. Hardin_, Dec 15 2017