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, 5, 19, 13793, 7487, 235549, 4400752781, 1455564577, 75143281206379, 17910727755514921, 208450205999558953, 8864292850179951461, 36884532202496983982602507

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 * A357517 A122152 A104314

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