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 A330632 #7 Jan 09 2020 19:27:01 %S A330632 0,0,1,3,3,10,9,27,29,75,93,221,315,684,1095,2247,3855,7682,13797, %T A330632 27009,49939,96906,182361,352695,671091,1296855,2485533,4806075, %U A330632 9256395,17920857,34636833,67159047,130150587,252745365,490853415,954637555,1857283155 %N A330632 Number of n-bead bracelets using exactly three colors with no adjacent beads having the same color. %H A330632 Andrew Howroyd, <a href="/A330632/b330632.txt">Table of n, a(n) for n = 1..500</a> %Y A330632 Column 3 of A330341. %Y A330632 Cf. A208539. %K A330632 nonn %O A330632 1,4 %A A330632 _Andrew Howroyd_, Dec 21 2019