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Search: id:A060913
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| A060913 |
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E.g.f.: exp(x*exp(x*exp(x*exp(x))) + 1/3*x^3*exp(x*exp(x*exp(x)))^3). |
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+0
9
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| 1, 1, 3, 18, 157, 1656, 20727, 300784, 4955337, 91229616, 1853584651, 41147256624, 989990665677, 25647894553048, 711630284942319, 21049888453838136, 661180220075555473, 21976354057916680416
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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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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 = 3.
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CROSSREFS
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Cf. A000949 - A000951, A060905 - A060913.
Sequence in context: A145350 A107888 A138274 this_sequence A116956 A075678 A089901
Adjacent sequences: A060910 A060911 A060912 this_sequence A060914 A060915 A060916
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KEYWORD
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nonn
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AUTHOR
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Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 07 2001
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