A013043 sech(sinh(x)+arcsin(x))=1-4/2!*x^2+64/4!*x^4-2464/6!*x^6...

1, -4, 64, -2464, 176000, -20274304, 3418964992, -795860555520, 244118384340992, -95517422279237632, 46396805200416325632, -27406009571869059219456, 19339103621838228194852864

Offset

0,2

Links

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

Mathematica

With[{nn=30}, Take[CoefficientList[Series[Sech[Sinh[x]+ArcSin[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Feb 10 2016 *)

Crossrefs

Sequence in context: A298433 A261042 A002454 * A296741 A167406 A156631

Adjacent sequences: A013040 A013041 A013042 * A013044 A013045 A013046

Keyword

sign

Author

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

Status

approved