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 A222278 #6 Jul 23 2025 02:27:54 %S A222278 625,972405,1513010465,2354171487645,3662978221194885, %T A222278 5699418948690910545,8868023343395876315745, %U A222278 13798220262404977892742445,21469370911390982766132649045,33405314494566540518963638820105 %N A222278 Number of nX5 0..5 arrays with no entry increasing mod 6 by 5 rightwards or downwards, starting with upper left zero. %C A222278 Column 5 of A222281 %H A222278 R. H. Hardin, <a href="/A222278/b222278.txt">Table of n, a(n) for n = 1..135</a> %F A222278 Empirical: a(n) = 1784*a(n-1) -372607*a(n-2) +28170251*a(n-3) -798596554*a(n-4) +1889917225*a(n-5) +177172468750*a(n-6) -651776500000*a(n-7) %e A222278 Some solutions for n=2 %e A222278 ..0..0..1..3..3....0..0..3..1..2....0..0..0..0..2....0..0..3..4..1 %e A222278 ..2..0..2..5..3....0..4..4..1..2....1..3..0..1..3....2..3..0..1..2 %K A222278 nonn %O A222278 1,1 %A A222278 _R. H. Hardin_ Feb 14 2013