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Search: id:A099617
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| A099617 |
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Denominators of coefficients in expansion of sec x + tan x. |
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+0
3
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| 1, 1, 2, 3, 24, 15, 720, 315, 8064, 2835, 3628800, 155925, 95800320, 6081075, 87178291200, 638512875, 4184557977600, 10854718875, 6402373705728000, 1856156927625, 97316080327065600, 194896477400625, 1124000727777607680000, 2900518163668125, 9545360026665222144000
(list; graph; listen)
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OFFSET
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0,3
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LINKS
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L. Euler, On the sums of series of reciprocals, par. 13.
L. Euler, De summis serierum reciprocarum, E41, par. 13.
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EXAMPLE
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1+x+1/2*x^2+1/3*x^3+5/24*x^4+2/15*x^5+61/720*x^6+17/315*x^7+...
1, 1, 1/2, 1/3, 5/24, 2/15, 61/720, 17/315, 277/8064, 62/2835, 50521/3628800, 1382/155925, 540553/95800320, ... = A099612/A099617
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CROSSREFS
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Cf. A099612.
Sequence in context: A095996 A061098 A119619 this_sequence A092043 A055067 A037319
Adjacent sequences: A099614 A099615 A099616 this_sequence A099618 A099619 A099620
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KEYWORD
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nonn,frac
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Nov 19 2004
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