A009271 - OEIS

A009271

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

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

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

LINKS

Table of n, a(n) for n=0..15.

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 *)

CROSSREFS

Sequence in context: A202751 A227160 A191604 * A153539 A153567 A153530

Adjacent sequences: A009268 A009269 A009270 * A009272 A009273 A009274

KEYWORD

sign

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs by Olivier Gérard, Mar 15 1997

STATUS

approved