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 A284111 #6 Apr 05 2020 22:31:16 %S A284111 19,571,20275,1143533,61595318,3514396333,202053817163,11804599876991, %T A284111 696189477669561,41397421665690592,2478089134627067931, %U A284111 149178023741969838411,9023810344121753702370,548148352070756658354415 %N A284111 Number of n X 6 0..1 arrays with the number of 1's king-move adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero. %C A284111 Column 6 of A284113. %H A284111 R. H. Hardin, <a href="/A284111/b284111.txt">Table of n, a(n) for n = 1..49</a> %e A284111 Some solutions for n=3 %e A284111 ..0..1..0..0..0..1. .0..0..0..1..1..1. .0..0..1..0..1..1. .0..0..0..1..1..0 %e A284111 ..0..0..1..1..0..1. .0..1..1..0..0..1. .1..1..0..1..1..0. .1..0..1..0..0..1 %e A284111 ..1..1..0..0..1..1. .1..1..1..0..0..0. .0..0..1..0..1..0. .1..1..1..0..1..0 %Y A284111 Cf. A284113. %K A284111 nonn %O A284111 1,1 %A A284111 _R. H. Hardin_, Mar 20 2017