

A013552


Numerator of [x^(2n+1)] of the Taylor series sin(cot(x)coth(x)).


1



2, 4, 136, 656, 47672, 3091664, 16788784, 15764283616, 3729134588968, 119174509180016, 1148737050343959536, 149765188779100064, 756009870577278864656, 3746439312393916961802272
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OFFSET

0,1


LINKS

G. C. Greubel, Table of n, a(n) for n = 0..200


EXAMPLE

2x/3 +4x^3/81 136x^5/25515 +656x^7/688905...


MATHEMATICA

Numerator[Take[CoefficientList[Series[Sin[Cot[x]  Coth[x]], {x, 0, 26}], x], {2, 1, 2}]] (* G. C. Greubel, Nov 13 2016 *)


CROSSREFS

Sequence in context: A018500 A271677 A226070 * A018512 A018517 A018539
Adjacent sequences: A013549 A013550 A013551 * A013553 A013554 A013555


KEYWORD

sign,frac


AUTHOR

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


EXTENSIONS

Name edited by R. J. Mathar, Dec 21 2011


STATUS

approved



