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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: A232252 A002239 A322929 * 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 November 27 16:35 EST 2021. Contains 349394 sequences. (Running on oeis4.)