1,2

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

F. Harary and R. W. Robinson, Labeled bipartite blocks, Canad. J. Math., 31 (1979), 60-68.

Adjacent sequences: A005330 A005331 A005332 this_sequence A005334 A005335 A005336

Sequence in context: A012811 A060486 A002438 this_sequence A162087 A068531 A144139

nonn

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