1,4

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

F. Harary and E. M. Palmer, Graphical Enumeration, Academic Press, NY, 1973, p. 18, table 1.5.1, column 3 (divided by 8).

R. C. Read, The number of k-colored graphs on labeled nodes, Canad. J. Math., 12 (1960), 410-414.

R. C. Read, personal communication.

Cf. A000683. A diagonal of A058843.

Sequence in context: A097192 A126153 A002553 this_sequence A118051 A160038 A093456

Adjacent sequences: A006198 A006199 A006200 this_sequence A006202 A006203 A006204

nonn,easy,nice

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

More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Feb 03 2000