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A060912
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E.g.f.: exp(x*exp(x*exp(x*exp(x*exp(x)))) + 1/2*x^2*exp(x*exp(x*exp(x*exp(x))))^2).
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0
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1, 1, 4, 25, 218, 2451, 33112, 516727, 9117180, 179330905, 3890434256, 92271385449, 2374775505016, 65900749176835, 1961009596461840, 62275489622799751, 2101798757669917328, 75111617959762807473
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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 = 4, m = 2.
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CROSSREFS
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Cf. A000949 - A000951, A060905 - A060913.
Sequence in context: A007830 A218826 A060911 * A209319 A050386 A001247
Adjacent sequences: A060909 A060910 A060911 * A060913 A060914 A060915
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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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