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 A216791 #5 Jul 22 2025 23:35:31 %S A216791 1,31,2976610,39123956055580,69275022816331822721697 %N A216791 Number of 5-colorings of a side-n hexagonal array with colors introduced in row major order. %C A216791 Column 4 of A216792 %e A216791 Some solutions for n=3 %e A216791 ......0.1.2..........0.1.2..........0.1.2..........0.1.0..........0.1.0 %e A216791 .....1.2.3.1........2.3.0.1........3.2.0.1........1.2.3.1........1.2.3.1 %e A216791 ....0.3.0.2.0......3.0.2.3.0......2.1.3.2.0......2.3.0.2.3......2.3.0.2.3 %e A216791 .....1.2.1.3........1.3.0.1........3.0.1.3........1.2.3.0........1.2.3.1 %e A216791 ......0.3.2..........2.1.2..........1.2.0..........3.1.2..........3.0.2 %K A216791 nonn %O A216791 1,2 %A A216791 _R. H. Hardin_ Sep 16 2012