A012543 sec(sinh(x)*arcsin(x))=1+12/4!*x^4+240/6!*x^6+15120/8!*x^8...

1, 0, 12, 240, 15120, 1355520, 182229696, 33914060544, 8338432876800, 2621544212398080, 1025337444571630592, 488344333262321119232, 278250960368816815149056, 186888075247900824522915840

Offset

0,3

Links

Table of n, a(n) for n=0..13.

Mathematica

With[{nn=30}, Take[CoefficientList[Series[Sec[Sinh[x]ArcSin[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Apr 13 2015 *)

Crossrefs

Sequence in context: A174556 A012349 A012302 * A012350 A220216 A126687

Adjacent sequences: A012540 A012541 A012542 * A012544 A012545 A012546

Keyword

nonn

Author

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

Status

approved