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 A222442 #6 Aug 19 2022 14:11:40 %S A222442 243,50421,10499787,2187822609,455924913093,95013316876491, %T A222442 19800569621116647,4126399930787828049,859933842854600077173, %U A222442 179208573795933519199311,37346725549299749805268107 %N A222442 Number of n X 6 0..3 arrays with entries increasing mod 4 by 0, 1 or 2 rightwards and downwards, starting with upper left zero. %C A222442 Column 6 of A222444. %H A222442 R. H. Hardin, <a href="/A222442/b222442.txt">Table of n, a(n) for n = 1..210</a> %F A222442 Empirical: a(n) = 312*a(n-1) -25524*a(n-2) +890339*a(n-3) -15323331*a(n-4) +129432870*a(n-5) -387838226*a(n-6) -1530469395*a(n-7) +14599631124*a(n-8) -35234863780*a(n-9) +5987707122*a(n-10) +87399541374*a(n-11) -99581148396*a(n-12) +21008679048*a(n-13). %e A222442 Some solutions for n=3 %e A222442 ..0..0..0..2..0..2....0..0..0..2..0..1....0..0..0..2..0..0....0..0..0..2..0..1 %e A222442 ..0..2..0..0..1..2....0..1..2..2..0..1....0..1..2..0..2..2....0..2..2..0..1..1 %e A222442 ..0..0..1..1..2..3....0..1..3..3..0..1....0..2..3..1..3..3....0..2..2..2..2..2 %Y A222442 Cf. A222444. %K A222442 nonn %O A222442 1,1 %A A222442 _R. H. Hardin_, Feb 20 2013