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 A222143 #6 Jul 23 2025 02:25:01 %S A222143 4096,19307236,91058563924,429480137694664,2025664524518719732, %T A222143 9554152945600145235628,45062665956031451017237456, %U A222143 212540440581498107104494924076,1002458198124109454670263957843332 %N A222143 Number of nX7 0..4 arrays with no entry increasing mod 5 by 4 rightwards or downwards, starting with upper left zero. %C A222143 Column 7 of A222144 %H A222143 R. H. Hardin, <a href="/A222143/b222143.txt">Table of n, a(n) for n = 1..33</a> %e A222143 Some solutions for n=2 %e A222143 ..0..0..0..0..1..3..4....0..0..0..0..1..1..4....0..0..0..0..1..3..1 %e A222143 ..1..2..0..0..2..4..0....1..2..0..2..2..4..0....2..0..0..2..3..4..1 %K A222143 nonn %O A222143 1,1 %A A222143 _R. H. Hardin_ Feb 09 2013