OFFSET
0,2
COMMENTS
Note that a(25) is negative. - Vaclav Kotesovec, Feb 06 2015
LINKS
Vaclav Kotesovec, Table of n, a(n) for n = 0..190
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[Tan[Tan[ArcSinh[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Oct 21 2014 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved