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A067654
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Numerators of the coefficients in power series expansion of exp(2x/(1-x)).
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1
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2, 4, 22, 38, 314, 1504, 16346, 24796, 331906, 2426404, 38445118, 163944598, 2993870654, 2647864592, 601353085846, 820420721222, 18874008233858, 20741357283932, 5782164084903302, 38314394323494974, 1059898973520975218
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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REFERENCES
| 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
| a(n) is the numerator of sum(i=1, n, C(n-1, i-1)*2^i/i!)
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CROSSREFS
| Cf. A067655.
Sequence in context: A151808 A151809 A151801 * A152120 A072355 A134246
Adjacent sequences: A067651 A067652 A067653 * A067655 A067656 A067657
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KEYWORD
| nonn,frac
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AUTHOR
| Benoit Cloitre (benoit7848c(AT)orange.fr), Feb 03 2002
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