A012612 arcsin(arcsinh(x)*tan(x))=2/2!*x^2+4/4!*x^4+230/6!*x^6+3848/8!*x^8...

2, 4, 230, 3848, 739018, 41124620, 15086858670, 1991912000016, 1097015309746578, 280098851345357332, 209537736711807583862, 90218727574059928609048, 87280770952178581593296986

Offset

0,1

Links

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

Mathematica

With[{nn=30}, Take[CoefficientList[Series[ArcSin[ArcSinh[x]Tan[x]], {x, 0, nn}], x] Range[0, nn]!, {3, -1, 2}]] (* Harvey P. Dale, Nov 27 2020 *)

Crossrefs

Sequence in context: A018715 A018720 A012666 * A012560 A012556 A329418

Adjacent sequences: A012609 A012610 A012611 * A012613 A012614 A012615

Keyword

nonn

Author

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

Status

approved