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A012548 arctan(sinh(x)*tan(x))=2/2!*x^2+12/4!*x^4-98/6!*x^6-16968/8!*x^8... 0
2, 12, -98, -16968, -780838, 93371652, 31402903222, 2306688997872, -1741952370835918, -849143623135762308, -14075683397521166258, 228742196475611564627112, 136676421833398225367464202 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..12.

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[ArcTan[Sinh[x]Tan[x]], {x, 0, nn}], x] Range[0, nn]!, {3, -1, 2}]] (* Harvey P. Dale, Oct 17 2015 *)

CROSSREFS

Sequence in context: A245897 A231173 A303203 * A012550 A009816 A227084

Adjacent sequences:  A012545 A012546 A012547 * A012549 A012550 A012551

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified August 12 13:08 EDT 2022. Contains 356077 sequences. (Running on oeis4.)