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A163948
The number of functions on a finite set that are obtainable by a composition power (excluding identity as power).
2
1, 4, 21, 172, 1725, 21066, 307111
OFFSET
1,2
COMMENTS
The complementary set to A163947.
FORMULA
a(n) = n^n - A163947(n).
CROSSREFS
Sequence in context: A217484 A078670 A317104 * A278993 A306067 A230682
KEYWORD
more,nonn
AUTHOR
Carlos Alves, Aug 06 2009
STATUS
approved