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A012982 cosh(arctan(x)+sin(x))=1+4/2!*x^2-8/4!*x^4-26/6!*x^6+424/8!*x^8... 1
1, 4, -8, -26, 424, 4314, 1175508, -586563610, 202456213808, -74723085885198, 31720351727685548, -15704109567909173154, 9057266333254873075336, -6050602176713431738303574, 4648623295941041403621558724 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..25

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Cosh[ArcTan[x]+Sin[x]], {x, 0, nn}], x]Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Nov 16 2011 *)

CROSSREFS

Sequence in context: A126733 A297695 A218079 * A012952 A272588 A272228

Adjacent sequences:  A012979 A012980 A012981 * A012983 A012984 A012985

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified February 26 09:39 EST 2020. Contains 332277 sequences. (Running on oeis4.)