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 A202633 #7 Jul 22 2025 16:44:08 %S A202633 36,2428,143028,8196796,464590190,26143599304,1464347535012, %T A202633 81766083532136,4555446633690226,253375514864780928, %U A202633 14074813726276067778,781057432128507731780,43308319465255378496036,2399781752411015808001612 %N A202633 Number of nX3 0..3 arrays with adjacent row and column sums unequal. %C A202633 Column 3 of A202636 %H A202633 R. H. Hardin, <a href="/A202633/b202633.txt">Table of n, a(n) for n = 1..18</a> %e A202633 Some solutions for n=3 %e A202633 ..2..0..1....0..0..3....2..1..1....0..3..1....2..3..0....3..2..2....1..2..2 %e A202633 ..2..3..3....1..2..2....3..3..3....0..2..0....1..0..2....2..3..0....1..2..1 %e A202633 ..2..2..3....0..0..1....2..2..1....1..3..1....1..3..3....3..0..0....2..2..2 %K A202633 nonn %O A202633 1,1 %A A202633 _R. H. Hardin_ Dec 21 2011