1,2

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

A. K. Dewdney, Three classes of graph invariants and their powers, pp. 243-263 of Proc. 9th S-E Conf. Combinatorics, Graph Theory, Computing, Congr. Numer. 21 (1978).

Sequence in context: A124835 A125799 A087378 this_sequence A114957 A002773 A112706

Adjacent sequences: A004249 A004250 A004251 this_sequence A004253 A004254 A004255

nonn,more,nice

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