3,2

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

C. F. Earl and L. J. March, Architectural applications of graph theory, pp. 327-355 of R. J. Wilson and L. W. Beineke, editors, Applications of Graph Theory. Academic Press, NY, 1979.

Sequence in context: A148194 A027695 A148195 this_sequence A148196 A148197 A148198

Adjacent sequences: A005025 A005026 A005027 this_sequence A005029 A005030 A005031

nonn

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