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A012070 tanh(arcsin(arcsin(x)))=x+4/5!*x^5+136/7!*x^7+9424/9!*x^9... 0
1, 0, 4, 136, 9424, 1075264, 183697344, 43928797056, 14007826346240, 5742582570096640, 2941974233347077120, 1841370038568483235840, 1382314169497713897656320, 1225713884449600233499770880 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Tanh[ArcSin[ArcSin[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Feb 12 2015 *)

CROSSREFS

Sequence in context: A024264 A012052 A054052 * A001374 A229416 A155207

Adjacent sequences:  A012067 A012068 A012069 * A012071 A012072 A012073

KEYWORD

nonn

AUTHOR

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

STATUS

approved

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Last modified November 27 07:28 EST 2021. Contains 349365 sequences. (Running on oeis4.)