OFFSET
0,4
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
MATHEMATICA
With[{nn=20}, CoefficientList[Series[Exp[ArcTan[ArcTan[x]]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Aug 14 2014 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
Definition edited and clarified by Harvey P. Dale, Aug 14 2014
STATUS
approved