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Search: id:A132219
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A132219 Number of line graphs on n labeled nodes. +0
2
1, 2, 8, 66, 774, 11885, 230858, 5512821, 157926273, 5323010347, 207833183972, 9280406921629, 468879370270319, 26561064972285450, 1673867356632729422, 116555375609273658636, 8914259769349445083676, 744876885721366948399627 (list; graph; listen)
OFFSET

1,2

FORMULA

E.g.f.: exp(x/2-x^3/6)*Sum(A020556(n)*(ln(1+x)/2)^n/n!, n=0..infinity).

CROSSREFS

Cf. A132220(unlabeled case).

Sequence in context: A011836 A100623 A086594 this_sequence A023164 A053922 A030445

Adjacent sequences: A132216 A132217 A132218 this_sequence A132220 A132221 A132222

KEYWORD

nonn

AUTHOR

Vladeta Jovovic (vladeta(AT)eunet.rs), Aug 14 2007

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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