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Search: id:A067655
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| A067655 |
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Denominators of the coefficients in exp(2x/(1-x)) power series. |
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+0
4
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| 1, 1, 3, 3, 15, 45, 315, 315, 2835, 14175, 155925, 467775, 6081075, 3869775, 638512875, 638512875, 10854718875, 8881133625, 1856156927625, 9280784638125, 194896477400625, 2143861251406875, 2595200462229375
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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Differs from A049606 at positions enumerated by A097324.
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REFERENCES
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K. Knopp "Theory and application of infinite series" Dover p. 547
O. Perron "Uber das infinitare Verhalten der koeffizienten einer gewissen Potenzreihe", Archiv d. math.u.Phys.(3), Vol. 22, pp. 329-340. 1914
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FORMULA
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a(n) is the denominator in sum(i=1, n, C(n-1, i-1)*2^i/i!)
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CROSSREFS
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Cf. A067654.
Adjacent sequences: A067652 A067653 A067654 this_sequence A067656 A067657 A067658
Sequence in context: A056314 A078631 A046983 this_sequence A049606 A046126 A089403
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KEYWORD
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nonn,frac
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), Feb 03 2002
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