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A013531 Numerator of [x^(2n+1)] in the Taylor expansion arcsin(cosec(x) - cosech(x)) = x/3 + x^3/162 + 5*x^5/1134 + 19*x^7/76545 + 13793*x^9/218245104 + ... 1
1, 1, 5, 19, 13793, 7487, 235549, 4400752781, 1455564577, 75143281206379, 17910727755514921, 208450205999558953, 8864292850179951461, 36884532202496983982602507 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..235

MATHEMATICA

Select[Numerator[CoefficientList[Series[ArcSin[1/Sin[x]  - 1/Sinh[x]], {x, 0, 52}], x]], # != 0 &] (* G. C. Greubel, Nov 11 2016 *)

CROSSREFS

Cf. A068917.

Sequence in context: A280034 A270486 A278562 * A122152 A104314 A302662

Adjacent sequences:  A013528 A013529 A013530 * A013532 A013533 A013534

KEYWORD

nonn,frac

AUTHOR

Patrick Demichel (patrick.demichel(AT)hp.com)

EXTENSIONS

Name edited by R. J. Mathar, Dec 20 2011

STATUS

approved

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Last modified December 1 20:54 EST 2020. Contains 338858 sequences. (Running on oeis4.)