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 A214137 #8 Jul 22 2025 23:09:51 %S A214137 11,3074,1101051,396246659,142612676441,51327630988519, %T A214137 18473293023759681,6648710425444606279,2392932882341580821521, %U A214137 861238858813625796412439,309967896468864954647672961,111560336436381065332976408999 %N A214137 Number of 0..4 colorings on an nX5 array circular in the 5 direction with new values 0..4 introduced in row major order. %C A214137 Column 4 of A214141 %H A214137 R. H. Hardin, <a href="/A214137/b214137.txt">Table of n, a(n) for n = 1..210</a> %F A214137 Empirical: a(n) = 373*a(n-1) -4754*a(n-2) +15312*a(n-3). %F A214137 Empirical: G.f. -x*(11-1029*x+6743*x^2) / ( (6*x-1)*(2552*x^2-367*x+1) ). - _R. J. Mathar_, Jul 07 2012 %e A214137 Some solutions for n=4 %e A214137 ..0..1..2..0..2....0..1..0..1..2....0..1..2..0..1....0..1..2..3..4 %e A214137 ..1..0..1..2..3....1..2..3..2..3....1..2..3..1..0....1..4..3..4..2 %e A214137 ..0..2..3..4..1....2..1..4..3..4....4..0..4..2..3....0..1..2..1..3 %e A214137 ..3..4..1..3..4....3..2..1..4..1....3..4..2..1..4....1..4..3..2..4 %K A214137 nonn %O A214137 1,1 %A A214137 _R. H. Hardin_ Jul 05 2012