A013428 sec(arcsin(x)-tanh(x))=1+90/6!*x^6-1176/8!*x^8+185094/10!*x^10...

1, 0, 0, 90, -1176, 185094, 5520372, 1212373162, 360563171248, 54782671966798, 28420007004983564, 9501613654091931218, 4976784878396711868488, 2978748297366502676647350

Offset

0,4

Links

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

Mathematica

With[{nn=30}, Take[CoefficientList[Series[Sec[ArcSin[x]-Tanh[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, May 17 2013 *)

Crossrefs

Sequence in context: A048548 A013427 A013425 * A013429 A008449 A213455

Adjacent sequences: A013425 A013426 A013427 * A013429 A013430 A013431

Keyword

sign

Author

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

Status

approved