OFFSET
0,2
FORMULA
a(n) ~ (-1)^(n+1) * sin(1) * 2^(2*n) * n^(2*n-1) / exp(2*n + sin(1)*Pi/2). - Vaclav Kotesovec, Nov 01 2013
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[Exp[ArcSinh[x]Sinh[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, May 05 2013 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved