2,3
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
P. Steinbach, Field Guide to Simple Graphs. Design Lab, Albuquerque NM, 1990.
Sequence in context: A099553 A119694 A121949 this_sequence A064835 A025590 A122932
Adjacent sequences: A005141 A005142 A005143 this_sequence A005145 A005146 A005147
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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