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A060911
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E.g.f.: exp(x*exp(x*exp(x*exp(x))) + 1/2*x^2*exp(x*exp(x*exp(x)))^2).
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0
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1, 1, 4, 25, 218, 2331, 29152, 417607, 6746700, 121312441, 2401341056, 51857779689, 1212621122176, 30509979042115, 821524617293304, 23563369209520711, 717014609781379568, 23064363484845390513
(list;
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refs;
listen;
history;
text;
internal format)
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OFFSET
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0,3
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REFERENCES
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I. P. Goulden and D. M. Jackson, Combinatorial Enumeration, Wiley, N.Y., 1983.
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LINKS
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Table of n, a(n) for n=0..17.
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FORMULA
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E.g.f.: exp(Sum_{d|m} T_k^d/d), where T_k = x*exp(T_(k - 1)), k >= 1, T_0 = x; k = 3, m = 2.
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CROSSREFS
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Cf. A000949 - A000951, A060905 - A060913.
Sequence in context: A198198 A007830 A218826 * A060912 A209319 A050386
Adjacent sequences: A060908 A060909 A060910 * A060912 A060913 A060914
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KEYWORD
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nonn,changed
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AUTHOR
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Vladeta Jovovic, Apr 07 2001
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STATUS
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approved
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