login
A012558
arctan(sinh(x)*arctan(x))=2/2!*x^2-4/4!*x^4-130/6!*x^6+2200/8!*x^8...
0
0, 2, -4, -130, 2200, 393178, -36230060, -2241493098, 696842413488, 151155071419698, -94998751466350804, 4870009119362109230, 9231493784347343489864, 1174397467642045406094346
OFFSET
0,2
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[ArcTan[Sinh[x]*ArcTan[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Ray Chandler, Nov 28 2016 *)
CROSSREFS
Sequence in context: A326213 A369699 A012561 * A012617 A012614 A018500
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved