OFFSET
1,2
REFERENCES
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).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
CROSSREFS
KEYWORD
nonn,more,nice
AUTHOR
STATUS
approved
