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A009659 Expansion of tan(sin(tan(x))). 0
1, 3, 33, 571, 897, -2454829, -541025183, -111302329717, -24150003737343, -5473538199891421, -1184916732110463071, -160650662732139980197, 73044130261960254992001, 109307715032177255302278131 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..13.

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Tan[Sin[Tan[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Jan 02 2018 *)

CROSSREFS

Sequence in context: A092170 A083080 A002916 * A144756 A336636 A326328

Adjacent sequences:  A009656 A009657 A009658 * A009660 A009661 A009662

KEYWORD

sign

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs by Olivier Gérard, Mar 15 1997

Prior Mathematica program replaced by Harvey P. Dale, Jan 02 2018

STATUS

approved

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Last modified August 9 04:39 EDT 2020. Contains 336319 sequences. (Running on oeis4.)