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A121227 Number of labeled multigraphs with loops and with n edges and no vertex of degree 0. 1
1, 2, 14, 150, 2210, 41642, 956878, 25955630, 811819826, 28764498386, 1138755852990, 49817190098694, 2386544217733906, 124257113538066522, 6986465328614267742, 421887743219324342110, 27231714819135144778722, 1871047822756547798671074 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Unlabeled analog is A007717.

LINKS

Nathaniel Johnston, Table of n, a(n) for n = 0..75

MAPLE

seq(sum(binomial(m*(m+1)/2+n-1, n)/2^(m+1), m=0..infinity), n=0..10);

CROSSREFS

Sequence in context: A100510 A087132 A036079 * A250916 A211398 A219430

Adjacent sequences:  A121224 A121225 A121226 * A121228 A121229 A121230

KEYWORD

easy,nonn

AUTHOR

Vladeta Jovovic, Sep 06 2006

STATUS

approved

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Last modified June 27 11:25 EDT 2017. Contains 288788 sequences.