1,2

R. C. Read, On the enumeration of a class of plane multigraphs, Aequat. Math., 31 (1986), 47-63.

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

Sequence in context: A114198 A055836 A076177 this_sequence A126033 A007863 A030823

Adjacent sequences: A007161 A007162 A007163 this_sequence A007165 A007166 A007167

nonn

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