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A034381 Number of labeled cyclic groups. 3
1, 2, 3, 12, 30, 360, 840, 10080, 60480, 907200, 3991680, 119750400, 518918400, 14529715200, 163459296000, 2615348736000, 22230464256000, 1067062284288000, 6758061133824000, 304112751022080000 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

LINKS

Index entries for sequences related to enumerating groups.

FORMULA

n!/phi(n).

CROSSREFS

a(n)=A000142(n)/A000010(n)=A058161(n)*n. Cf. A034382, A034383.

Sequence in context: A169636 A105401 A073617 * A076424 A165301 A072440

Adjacent sequences:  A034378 A034379 A034380 * A034382 A034383 A034384

KEYWORD

nonn

AUTHOR

Christian G. Bower (bowerc(AT)usa.net)

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Last modified February 17 16:49 EST 2012. Contains 206058 sequences.