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A013555 Numerator of [x^(2n+1)] of the Taylor series arctan(cot(x)-coth(x))= -2*x/3 +8*x^3/81 -52*x^5/1701 +112*x^7/10935 -51412*x^9/13640319+... 1
-2, 8, -52, 112, -51412, 3469712, -2491688, 62534458528, -22811578796, 1052637839125232, -1951793355443020696, 1800318713817966304, -132444323199647003032, 130585857053193268706729632, -9112129339306147838595664 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..100

MATHEMATICA

Numerator[Take[CoefficientList[Series[ArcTan[Cot[x] - Coth[x]], {x, 0, 35}], x], {2, -2, 2}]] (* Vincenzo Librandi, Nov 12 2016 *)

CROSSREFS

Sequence in context: A059429 A249747 A191480 * A018987 A030518 A123188

Adjacent sequences:  A013552 A013553 A013554 * A013556 A013557 A013558

KEYWORD

sign,frac

AUTHOR

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

EXTENSIONS

Name edited by R. J. Mathar, Dec 22 2011

STATUS

approved

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Last modified June 27 15:06 EDT 2017. Contains 288790 sequences.