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Search: id:A060911
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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
1
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| 1, 1, 4, 25, 218, 2331, 29152, 417607, 6746700, 121312441, 2401341056, 51857779689, 1212621122176, 30509979042115, 821524617293304, 23563369209520711, 717014609781379568, 23064363484845390513
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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 = 2.
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CROSSREFS
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Cf. A000949 - A000951, A060905 - A060913.
Sequence in context: A049118 A047733 A007830 this_sequence A060912 A050386 A001247
Adjacent sequences: A060908 A060909 A060910 this_sequence A060912 A060913 A060914
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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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