A012561 tanh(sinh(x)*arctan(x))=2/2!*x^2-4/4!*x^4-130/6!*x^6+2200/8!*x^8...

2, -4, -130, 2200, 151258, -9618860, -546359658, 83826810288, 15550415673138, -5684890840251604, 671714199027714350, -198489523044256423096, 248879210344083276692746

Offset

0,1

Links

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

Mathematica

With[{nn=30}, Take[CoefficientList[Series[Tanh[Sinh[x]ArcTan[x]], {x, 0, nn}], x] Range[0, nn]!, {3, -1, 2}]] (* Harvey P. Dale, Apr 01 2023 *)

Crossrefs

Sequence in context: A009073 A326213 A369699 * A012558 A012617 A012614

Adjacent sequences: A012558 A012559 A012560 * A012562 A012563 A012564

Keyword

sign

Author

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

Status

approved