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A052170 Number of directed multigraphs with n arcs. 2
1, 1, 6, 24, 130, 688, 4211, 26840, 184153, 1328155, 10078617, 79926478, 660616432, 5671793248, 50459837996, 464139053799, 4405521306315, 43077862741114, 433275511964227, 4476516495577776, 47451864583578111, 515494036824348917, 5733423512317010811, 65226494052113260251, 758377712833720838677, 9004484581478188581057 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..25.

CROSSREFS

Cf. A050535, A007717, A037240, A050930.

Sequence in context: A224662 A200160 A219622 * A027224 A110707 A047712

Adjacent sequences:  A052167 A052168 A052169 * A052171 A052172 A052173

KEYWORD

nonn

AUTHOR

Vladeta Jovovic, Jan 26 2000

EXTENSIONS

a(16)-a(25) from Max Alekseyev, Jun 21 2011

STATUS

approved

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Last modified January 24 07:18 EST 2020. Contains 331189 sequences. (Running on oeis4.)