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Search: id:A099612
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| A099612 |
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Numerators of coefficients in expansion of sec x + tan x. |
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+0
7
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| 1, 1, 1, 1, 5, 2, 61, 17, 277, 62, 50521, 1382, 540553, 21844, 199360981, 929569, 3878302429, 6404582, 2404879675441, 443861162, 14814847529501, 18888466084, 69348874393137901, 113927491862, 238685140977801337, 58870668456604, 4087072509293123892361
(list; graph; listen)
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OFFSET
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0,5
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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. A099617.
Sequence in context: A117734 A007572 A095998 this_sequence A142599 A068566 A046270
Adjacent sequences: A099609 A099610 A099611 this_sequence A099613 A099614 A099615
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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 18 2004
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