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 A222168 #6 Jul 23 2025 02:26:54 %S A222168 729,199497,60481881,18838482047,5923189816253,1869223526083263, %T A222168 590771311004409091,186831129401198761761,59100748356892786911715, %U A222168 18697545591371281608525201,5915566903646796343481287921 %N A222168 Number of nX7 0..4 arrays with entries increasing mod 5 by 0, 1 or 2 rightwards and downwards, starting with upper left zero. %C A222168 Column 7 of A222169 %H A222168 R. H. Hardin, <a href="/A222168/b222168.txt">Table of n, a(n) for n = 1..210</a> %e A222168 Some solutions for n=3 %e A222168 ..0..0..0..1..1..2..4....0..0..0..1..1..3..3....0..0..0..0..1..1..3 %e A222168 ..0..0..0..1..3..4..1....0..0..0..2..3..3..3....0..0..0..2..3..3..0 %e A222168 ..0..0..1..3..0..1..1....0..0..1..3..3..4..0....0..1..1..3..3..3..0 %K A222168 nonn %O A222168 1,1 %A A222168 _R. H. Hardin_ Feb 10 2013