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 A284330 #6 Apr 05 2020 22:52:05 %S A284330 6,34,373,5130,70039,1000935,14581112,215806808,3229703988, %T A284330 48741017873,740325265021,11303036259207,173296776954307, %U A284330 2666236456702222,41141752932262310,636440516858225998,9866818127969621217 %N A284330 Number of n X 4 0..1 arrays with the number of 1's horizontally, diagonally or antidiagonally adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero. %C A284330 Column 4 of A284334. %H A284330 R. H. Hardin, <a href="/A284330/b284330.txt">Table of n, a(n) for n = 1..164</a> %e A284330 Some solutions for n=4 %e A284330 ..0..1..1..0. .0..0..0..1. .0..0..1..1. .0..1..0..0. .0..0..0..1 %e A284330 ..0..1..1..1. .0..0..0..1. .0..1..0..1. .0..0..1..1. .1..0..0..0 %e A284330 ..0..1..1..0. .1..1..1..0. .0..1..0..0. .0..1..1..1. .1..0..0..0 %e A284330 ..1..1..0..0. .1..0..0..1. .1..1..0..1. .1..1..1..0. .1..1..1..1 %Y A284330 Cf. A284334. %K A284330 nonn %O A284330 1,1 %A A284330 _R. H. Hardin_, Mar 25 2017