A007688 Number of 5-colorings of cyclic group of order n.
4, 16, 52, 144, 420, 816, 1732, 3508, 7060, 18640
Offset: 1
References
- N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Links
- R. Haas, Three-colorings of finite groups or an algebra of nonequalities, Math. Mag., 63 (1990), 211-225.
- R. Haas, Letter to N. J. A. Sloane, Aug. 1994
Crossrefs
Cf. A007687.
Extensions
a(6)-a(10) from Andrey Zabolotskiy, Jul 12 2017