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 A013530 Numerator of [x^(2n+1)] of the Taylor expansion sin(cosec(x) - cosech(x)) = x/3 - x^3/162 + 211*x^5/51030 -157*x^7/688905 + 439801*x^9/9821029680 - ... 1

%I #16 Nov 11 2016 21:48:36

%S 1,-1,211,-157,439801,-8013839,890107609,-1552280998637,

%T 76919615326361,-25930051873454543,659157886816533334709,

%U -1513017447627551117359,6612344442139455641066609,-112537977176478238359834596179

%N Numerator of [x^(2n+1)] of the Taylor expansion sin(cosec(x) - cosech(x)) = x/3 - x^3/162 + 211*x^5/51030 -157*x^7/688905 + 439801*x^9/9821029680 - ...

%C Essentially a bisection of A013529.

%H G. C. Greubel, <a href="/A013530/b013530.txt">Table of n, a(n) for n = 0..125</a>

%t Select[Numerator[CoefficientList[Series[Sin[1/Sin[x] - 1/Sinh[x]], {x, 0, 25}], x]], # != 0 &] (* _G. C. Greubel_, Nov 11 2016 *)

%Y Cf. A068917.

%K sign,frac

%O 0,3

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

%E Name edited by _R. J. Mathar_, Dec 20 2011

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Last modified May 29 14:43 EDT 2024. Contains 372952 sequences. (Running on oeis4.)