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 A284112 #6 Apr 05 2020 22:31:56 %S A284112 33,2095,67957,16442183,835390074,202053817163,12336109217951, %T A284112 2717300368732547,189648871247418668,38157272354610084376, %U A284112 2957145586181369921070,550690134528386541356991 %N A284112 Number of n X 7 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 A284112 Column 7 of A284113. %H A284112 R. H. Hardin, <a href="/A284112/b284112.txt">Table of n, a(n) for n = 1..28</a> %e A284112 Some solutions for n=3 %e A284112 ..0..1..0..1..0..0..0. .0..1..0..1..0..0..1. .0..0..1..0..1..1..0 %e A284112 ..0..0..0..1..0..1..1. .1..0..1..1..0..1..1. .1..1..1..0..0..0..1 %e A284112 ..1..1..1..0..1..1..1. .0..0..0..0..1..1..1. .1..1..0..0..0..1..1 %Y A284112 Cf. A284113. %K A284112 nonn %O A284112 1,1 %A A284112 _R. H. Hardin_, Mar 20 2017