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A330632
Number of n-bead bracelets using exactly three colors with no adjacent beads having the same color.
2
0, 0, 1, 3, 3, 10, 9, 27, 29, 75, 93, 221, 315, 684, 1095, 2247, 3855, 7682, 13797, 27009, 49939, 96906, 182361, 352695, 671091, 1296855, 2485533, 4806075, 9256395, 17920857, 34636833, 67159047, 130150587, 252745365, 490853415, 954637555, 1857283155
OFFSET
1,4
LINKS
CROSSREFS
Column 3 of A330341.
Cf. A208539.
Sequence in context: A286570 A134704 A057210 * A278832 A168376 A266221
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Dec 21 2019
STATUS
approved