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 A222339 #6 Jul 23 2025 02:30:22 %S A222339 7776,171774906,3794659477146,83827445649884946, %T A222339 1851823828949372226486,40908457493732914322944536, %U A222339 903704698269024081953765683446,19963651325646523604122389122602956 %N A222339 Number of nX6 0..6 arrays with no entry increasing mod 7 by 6 rightwards or downwards, starting with upper left zero. %C A222339 Column 6 of A222340 %H A222339 R. H. Hardin, <a href="/A222339/b222339.txt">Table of n, a(n) for n = 1..13</a> %e A222339 Some solutions for n=3 %e A222339 ..0..0..0..4..4..4....0..0..0..2..6..0....0..0..0..0..4..1....0..0..0..0..3..0 %e A222339 ..0..0..0..0..2..4....0..0..0..0..0..1....0..0..0..0..5..6....0..0..0..0..1..5 %e A222339 ..0..0..0..0..2..2....0..0..0..0..0..4....0..0..0..0..5..1....0..0..0..0..3..6 %K A222339 nonn %O A222339 1,1 %A A222339 _R. H. Hardin_ Feb 15 2013