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Search: id:A052105
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| A052105 |
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Denominators of coefficients in function a(x) such that a(a(x)) = exp(x) - 1. |
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+0
4
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| 1, 1, 4, 48, 1, 3840, 92160, 645120, 3440640, 30965760, 14863564800, 24222105600, 7847962214400, 40809403514880, 5713316492083200, 7617755322777600, 5484783832399872000, 5328075722902732800, 1220613711064989696000
(list; graph; listen)
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OFFSET
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0,3
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REFERENCES
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R. P. Stanley, Enumerative Combinatorics, Cambridge, Vol. 2, 1999; see Problem 6.52.
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EXAMPLE
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x+1/4*x^2+1/48*x^3+1/3840*x^5-7/92160*x^6+1/645120*x^7+...
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CROSSREFS
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Cf. A052104, A052122, A052123.
Sequence in context: A141040 A006422 A006438 this_sequence A010293 A157818 A048608
Adjacent sequences: A052102 A052103 A052104 this_sequence A052106 A052107 A052108
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KEYWORD
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nonn,easy,nice,frac
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Jan 22 2000
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