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A003083 Sum a(n) x^n / n = log (1 + Sum g(n) x^n ), where g(n) is # graphs on n nodes (A000088).
(Formerly M2691)
+0
1
1, 3, 7, 27, 106, 681, 5972, 88963, 2349727, 117165818, 11073706216, 1968717966417, 654366802299848, 406048824479878828, 470960717141418629512 (list; graph; listen)
OFFSET

1,2

REFERENCES

F. Harary and E. M. Palmer, Graphical Enumeration, Academic Press, NY, 1973, p. 91.

CROSSREFS

Sequence in context: A066021 A098465 A081562 this_sequence A062795 A062363 A136580

Adjacent sequences: A003080 A003081 A003082 this_sequence A003084 A003085 A003086

KEYWORD

nonn,easy

AUTHOR

njas

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.


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