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A013296 tan(arctanh(x)-log(x+1)) = 1/2!*x^2 + 6/4!*x^4 + 150/6!*x^6 + 7560/8!*x^8... 0
0, 1, 6, 150, 7560, 642600, 82328400, 14799985200, 3550699152000, 1095489931536000, 422416533258720000, 199001229578030880000, 112442434205652270720000, 75042084306026165328000000 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
FORMULA
a(n) ~ 2 * (2*n)! * exp(Pi*n) / (exp(Pi)-1)^(n+1). - Vaclav Kotesovec, Feb 06 2015
MATHEMATICA
nn = 20; Table[(CoefficientList[Series[Tan[ArcTanh[x] - Log[1 + x]], {x, 0, 2*nn}], x] * Range[0, 2*nn]!)[[n]], {n, 1, 2*nn+1, 2}] (* Vaclav Kotesovec, Feb 06 2015 *)
CROSSREFS
Sequence in context: A065946 A222051 A285747 * A013301 A233734 A227044
KEYWORD
nonn
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
a(0)=0 prepended by Vaclav Kotesovec, Feb 06 2015
Definition modified by Vaclav Kotesovec, Feb 06 2015
STATUS
approved

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Last modified March 28 12:59 EDT 2024. Contains 371254 sequences. (Running on oeis4.)