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A012769 tan(cosh(x)*arctan(x))=x+3/3!*x^3+45/5!*x^5+1071/7!*x^7+69177/9!*x^9... 1
1, 3, 45, 1071, 69177, 3986939, 609782693, 60159520487, 18315680711153, 2425226987446387, 1432393396034388637, 194035475753231168543, 248503763037617443112745, 18849742079674987910368107 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Note that a(15) is negative. - Vaclav Kotesovec, Feb 07 2015

LINKS

Vaclav Kotesovec, Table of n, a(n) for n = 0..200

MATHEMATICA

nn = 20; Table[(CoefficientList[Series[Tan[ArcTan[x]*Cosh[x]], {x, 0, 2*nn+1}], x] * Range[0, 2*nn+1]!)[[n]], {n, 2, 2*nn, 2}] (* Vaclav Kotesovec, Feb 07 2015 *)

CROSSREFS

Sequence in context: A171080 A188681 A012827 * A302106 A241242 A009088

Adjacent sequences:  A012766 A012767 A012768 * A012770 A012771 A012772

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified October 22 16:15 EDT 2021. Contains 348174 sequences. (Running on oeis4.)