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A013546 Numerator of [x^(2n)] in the Taylor expansion cosh(cosec(x)-coth(x))=1 +x^2/72 -215*x^4/31104 +199159*x^6/235146240-... 1

%I

%S 1,1,-215,199159,-4128623,257347648013,-111384981593,1407269115959761,

%T 69849267671401979,467410556088873329284747,

%U 429563383515510620615310131,652256640736921402479041889329,137438707390027290209533044701,432938003151091640246284451153923,5720446637387424876679468922735017734533

%N Numerator of [x^(2n)] in the Taylor expansion cosh(cosec(x)-coth(x))=1 +x^2/72 -215*x^4/31104 +199159*x^6/235146240-...

%C A bisection of A013536. Denominators are a bisection of A202382.

%H Vincenzo Librandi, <a href="/A013546/b013546.txt">Table of n, a(n) for n = 0..100</a>

%t Numerator[Take[CoefficientList[Series[Cosh[Csc[x] - Coth[x]], {x, 0, 35}], x], {1, -2, 2}]] (* _Vincenzo Librandi_, Nov 12 2016 *)

%K sign,frac

%O 0,3

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

%E Name edited by _R. J. Mathar_, Dec 21 2011

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Last modified January 17 15:20 EST 2022. Contains 350402 sequences. (Running on oeis4.)