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 A284107 #6 Apr 05 2020 22:28:24 %S A284107 2,4,13,46,160,571,2095,7802,29326,111040,422862,1617611,6210935, %T A284107 23922207,92387315,357629430,1387192894,5390374430,20979391112, %U A284107 81768490420,319107181678,1246785919174,4876478734046,19091509694075 %N A284107 Number of n X 2 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 A284107 Column 2 of A284113. %H A284107 R. H. Hardin, <a href="/A284107/b284107.txt">Table of n, a(n) for n = 1..210</a> %e A284107 Some solutions for n=4 %e A284107 ..0..1. .0..1. .0..1. .0..0. .0..0. .0..0. .0..1. .0..1. .0..0. .0..1 %e A284107 ..0..0. .1..0. .0..1. .1..1. .1..0. .1..1. .1..0. .1..1. .0..1. .0..1 %e A284107 ..1..1. .1..0. .1..0. .1..1. .1..1. .1..1. .1..0. .1..0. .1..1. .1..0 %e A284107 ..1..1. .0..1. .1..0. .1..1. .1..1. .0..0. .1..0. .0..0. .0..1. .0..1 %Y A284107 Cf. A284113. %K A284107 nonn %O A284107 1,1 %A A284107 _R. H. Hardin_, Mar 20 2017