A009488 - OEIS

A009488

E.g.f. sin(sinh(sin(x))) (odd powers only).

1, -1, -7, 223, -2959, -82721, 8156073, -239061825, -19348243487, 3454706477375, -182295608480935, -26905043182243041, 7790129367007385681, -641827191323121911009, -147325911341260680509175

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

OFFSET

1,3

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

sin(sinh(sin(x))) = x - 1/6*x^3 - 7/120*x^5 + 223/5040*x^7 - 2959/362880*x^9 - ...

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Sin[Sinh[Sin[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, May 07 2013 *)

CROSSREFS

Sequence in context: A231487 A140018 A202655 * A302059 A352312 A138247

Adjacent sequences: A009485 A009486 A009487 * A009489 A009490 A009491

KEYWORD

sign

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs by Olivier Gérard, Mar 15 1997

STATUS

approved