0,1

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

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

R. C. Mullin, E. Nemeth and P. J. Schellenberg, The enumeration of almost cubic maps, pp. 281-295 in Proceedings of the Louisiana Conference on Combinatorics, Graph Theory and Computer Science. Vol. 1, edited R. C. Mullin et al., 1970.

H. Bottomley, Illustration of initial terms

Sequence in context: A099669 A019520 A061190 this_sequence A065101 A052739 A135389

Adjacent sequences: A002003 A002004 A002005 this_sequence A002007 A002008 A002009

nonn

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