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A245506
Number of endofunctions f on [n] such that f^10(i) = f(i) for all i in [n].
2
1, 1, 3, 12, 73, 556, 4737, 44122, 453441, 5226984, 69703201, 1132247854, 22865062497, 541274154604, 13810143608913, 361165919643666, 9534875308290433, 254667431232941008, 6928956222876625473, 193066959857334885334, 5521621116955849623201
OFFSET
0,3
LINKS
FORMULA
E.g.f: exp(Sum_{j=0..2} (x*exp(x))^(3^j)/(3^j)).
MAPLE
egf:= exp(add((x*exp(x))^(3^j)/(3^j), j=0..2)):
a:= n-> n!*coeff(series(egf, x, n+1), x, n):
seq(a(n), n=0..25);
CROSSREFS
Column k=10 of A245501.
Sequence in context: A348222 A346664 A060906 * A275385 A247055 A163860
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Jul 24 2014
STATUS
approved