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A009721 Expansion of e.g.f.: tan(tanh(x)*exp(x)). 0
0, 1, 2, 3, 20, 157, 902, 6895, 77352, 837145, 9239882, 124480059, 1864519868, 28461793141, 470175087566, 8596601614567, 165789417707088, 3347308657310641, 72262366126097810, 1655981959056540147, 39676337445225379172, 996780437366905850317 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
MATHEMATICA
With[{nn=20}, CoefficientList[Series[Tan[Tanh[x]*Exp[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Sep 17 2016 *)
CROSSREFS
Sequence in context: A128977 A069323 A356884 * A013340 A218873 A012416
KEYWORD
nonn,easy
AUTHOR
EXTENSIONS
Extended and signs tested Mar 15 1997 by Olivier Gérard.
Definition clarified and prior Mathematica program replaced by Harvey P. Dale, Sep 17 2016
STATUS
approved

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Last modified March 18 22:34 EDT 2024. Contains 370951 sequences. (Running on oeis4.)