1,1

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

R. Haas, Three-colorings of finite groups or an algebra of nonequalities, Math. Mag., 63 (1990), 211-225.

Sequence in context: A027917 A038347 A117495 this_sequence A006308 A008837 A081950

Adjacent sequences: A007684 A007685 A007686 this_sequence A007688 A007689 A007690

nonn

N. J. A. Sloane (njas(AT)research.att.com).