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 A286214 #6 Apr 05 2020 23:27:33 %S A286214 1,912,34896,2053994,113258929,6553131164,380797680269,22418184755710, %T A286214 1330080388106827,79466576915681740,4775393278095153395, %U A286214 288397740505442452180,17492553727454266741242,1065040889415828916901252 %N A286214 Number of n X 6 0..1 arrays with the number of 1's king-move adjacent to some 0 two less than the number of 0's adjacent to some 1. %C A286214 Column 6 of A286216. %H A286214 R. H. Hardin, <a href="/A286214/b286214.txt">Table of n, a(n) for n = 1..48</a> %e A286214 Some solutions for n=3 %e A286214 ..1..0..0..1..0..0. .0..0..1..1..1..1. .1..1..0..0..1..0. .1..0..1..1..0..0 %e A286214 ..1..1..0..0..1..0. .0..1..0..0..0..0. .0..1..1..0..0..0. .1..0..0..0..1..1 %e A286214 ..0..1..1..0..0..1. .0..1..0..0..1..1. .0..1..0..0..1..1. .0..1..0..0..0..1 %Y A286214 Cf. A286216. %K A286214 nonn %O A286214 1,2 %A A286214 _R. H. Hardin_, May 04 2017