A013532 Numerator of [x^(2n+1)] in the Taylor series tan(cosec(x)-cosech(x)) = x/3 +x^3/81 +949*x^5/204120 +2647*x^7/5511240+... .

1, 1, 949, 2647, 6091583, 309884803, 24257706533, 19423358539261, 264554745901944637, 217615549372227323, 1019034322058704876807657, 1439067424977073452007609, 742090435456946501950120739, 92447561714992144826576923831967

Offset

0,3

Links

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

Mathematica

Numerator[Take[CoefficientList[Series[Tan[Csc[x] - Csch[x]], {x, 0, 50}], x], {2, -1, 2}]] (* G. C. Greubel, Nov 12 2016 *)

Crossrefs

Cf. A068917.

Sequence in context: A170830 A020366 A217936 * A108896 A260174 A285157

Adjacent sequences: A013529 A013530 A013531 * A013533 A013534 A013535

Keyword

nonn,frac

Author

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

Extensions

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

Status

approved