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A079860 Commuting permutations: number of ordered triples f, g, h in Symm(n) which all commute, divided by n!. 3
1, 4, 8, 21, 39, 92, 170 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

COMMENTS

Conjecture: a(n) = A061256(n). - Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Jan 16 2006.

REFERENCES

Computed by John McKay, Sep 06 2003

CROSSREFS

Cf. A072169/n!, A053529.

Sequence in context: A102559 A037020 A094878 * A006908 A061256 A180608

Adjacent sequences:  A079857 A079858 A079859 * A079861 A079862 A079863

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com), Sep 06 2003

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Last modified February 16 11:51 EST 2012. Contains 205908 sequences.