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 A284194 #6 Apr 05 2020 22:37:58 %S A284194 3,13,43,412,1919,18842,105367,983238,6123441,54284366,362590384, %T A284194 3094974718,21686456978,180282797672,1306154902037,10663354100162, %U A284194 79101065751066,637908191485185,4812317630514559,38492627004755585 %N A284194 Number of n X 3 0..1 arrays with the number of 1's horizontally, antidiagonally or vertically adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero. %C A284194 Column 3 of A284199. %H A284194 R. H. Hardin, <a href="/A284194/b284194.txt">Table of n, a(n) for n = 1..210</a> %e A284194 Some solutions for n=4 %e A284194 ..0..1..0. .0..0..1. .0..1..0. .0..0..0. .0..1..0. .0..0..1. .0..0..0 %e A284194 ..0..1..1. .0..1..1. .1..1..0. .1..0..1. .0..0..1. .1..1..0. .1..1..1 %e A284194 ..1..1..1. .0..1..1. .1..0..0. .1..1..1. .1..1..0. .1..1..0. .1..0..1 %e A284194 ..0..0..0. .0..1..1. .1..0..1. .1..0..0. .0..1..1. .0..1..0. .0..1..0 %Y A284194 Cf. A284199. %K A284194 nonn %O A284194 1,1 %A A284194 _R. H. Hardin_, Mar 22 2017