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Search: id:A102077
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| A102077 |
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Denominators of e.g.f. cosec(artanh(x)). |
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+0
2
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| 6, 12, 126, 72, 22, 252, 126, 144, 7182, 2772, 4554, 1512, 378, 84, 14322, 2464, 42, 14364, 342, 792, 1251558, 191268, 136206, 21168, 594, 1188, 33858, 1368, 1062, 257796, 128898, 576, 6407478, 17388, 295218, 948024, 79002, 158004, 89586, 14256
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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cosec(artanh(x)) = 1/x - x/6 - 1/12*x^3/3! + 125/126x^5/5! +...
cosech(arctan(x)) = 1/x + x/6 - 1/12*x^3/3! - 125/126x^5/5! +...
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MAPLE
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G:=series(csc(arctanh(x)), x=0, 92): seq(denom((2*n-1)!*coeff(G, x^(2*n-1))), n=1..45); (Deutsch)
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CROSSREFS
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Numerators are in A102076. Probably differs from A102062.
Sequence in context: A095388 A038515 A051586 this_sequence A102062 A070020 A002922
Adjacent sequences: A102074 A102075 A102076 this_sequence A102078 A102079 A102080
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KEYWORD
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nonn,frac
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AUTHOR
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Ralf Stephan, Dec 31 2004
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Feb 25 2005
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