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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
1, 1, -215, 199159, -4128623, 257347648013, -111384981593, 1407269115959761, 69849267671401979, 467410556088873329284747, 429563383515510620615310131, 652256640736921402479041889329, 137438707390027290209533044701, 432938003151091640246284451153923, 5720446637387424876679468922735017734533 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

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

LINKS

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

MATHEMATICA

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

CROSSREFS

Sequence in context: A085754 A232252 A002239 * A192073 A176766 A018863

Adjacent sequences:  A013543 A013544 A013545 * A013547 A013548 A013549

KEYWORD

sign,frac

AUTHOR

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

EXTENSIONS

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

STATUS

approved

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Last modified May 28 16:24 EDT 2017. Contains 287241 sequences.