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 A012162 tan(tan(arcsinh(x)))=x+3/3!*x^3+41/5!*x^5+1187/7!*x^7+62129/9!*x^9... 1
 1, 3, 41, 1187, 62129, 4782467, 547167193, 80119022947, 16118331113441, 3804780451118851, 1198259782941477641, 411098266056364045603, 189240360206280390564241, 87405020278156979563746947 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Note that a(25) is negative. - Vaclav Kotesovec, Feb 06 2015 LINKS Vaclav Kotesovec, Table of n, a(n) for n = 0..190 MATHEMATICA With[{nn=30}, Take[CoefficientList[Series[Tan[Tan[ArcSinh[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Oct 21 2014 *) CROSSREFS Sequence in context: A241704 A181675 A012053 * A012225 A012129 A012035 Adjacent sequences: A012159 A012160 A012161 * A012163 A012164 A012165 KEYWORD sign AUTHOR Patrick Demichel (patrick.demichel(AT)hp.com) STATUS approved

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Last modified December 7 23:30 EST 2023. Contains 367662 sequences. (Running on oeis4.)