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 A214189 #6 Jul 22 2025 23:12:29 %S A214189 4,18,353,7434,198052,5731144,172707247,5290686318,163203090770, %T A214189 5048858758020,156379568912461,4846014558069802,150203703987575008, %U A214189 4656019290676790496,144332757507860933195,4474265565293272517286 %N A214189 Number of 0..6 colorings of a 2X(n+1) array circular in the n+1 direction with new values 0..6 introduced in row major order. %C A214189 Row 2 of A214187 %H A214189 R. H. Hardin, <a href="/A214189/b214189.txt">Table of n, a(n) for n = 1..210</a> %F A214189 Empirical: a(n) = 39*a(n-1) -133*a(n-2) -3905*a(n-3) +6437*a(n-4) +125497*a(n-5) +83961*a(n-6) -931595*a(n-7) -1308936*a(n-8) +809964*a(n-9) +1218672*a(n-10) %e A214189 Some solutions for n=4 %e A214189 ..0..1..2..3..1....0..1..0..1..2....0..1..2..0..1....0..1..2..0..1 %e A214189 ..2..3..0..1..0....2..3..1..0..1....3..4..5..3..6....1..2..0..1..0 %K A214189 nonn %O A214189 1,1 %A A214189 _R. H. Hardin_ Jul 07 2012