A009271 Expansion of exp(tanh(x)*sinh(x)).

1, 2, 8, 62, 968, 9962, 557108, -202018, 851334128, 16341130322, -6757456189972, 2480221403307782, -678177401929552792, 194099813539570880762, -58073452241962644117532, 18437894946039087568249262

Offset: 0

Author

R. H. Hardin

Keywords

• sign

Programs

Mathematica

With[{nn=30},Take[CoefficientList[Series[Exp[Tanh[x]Sinh[x]],{x,0,nn}], x] Range[0,nn]!,{1,-1,2}]] (* Harvey P. Dale, Mar 16 2013 *)

Extensions

Extended with signs by Olivier Gérard, Mar 15 1997