A024241 E.g.f. tan(x)*sin(tanh(x))/2 (even powers only).

0, 1, -2, 99, -2020, 158437, -9588134, 1187244807, -141412522312, 26139574347337, -5065084577305802, 1323760751709283371, -375086579956164869164, 132463397392835073766957, -51304161208549419113557358

Offset

0,3

Links

Table of n, a(n) for n=0..14.

Example

tan(x)*sin(tanh(x))/2 = x^2 - 2*x^4 + 99*x^6 - 2020*x^8 + 158437*x^10 -+ ...

Mathematica

With[{nn=30}, Take[CoefficientList[Series[Tan[x]Sin[Tanh[x]]/2, {x, 0, nn}], x]Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Jan 12 2013 *)

Crossrefs

Cf. A009743.

Sequence in context: A324266 A258399 A212838 * A278684 A024242 A276386

Adjacent sequences: A024238 A024239 A024240 * A024242 A024243 A024244

Keyword

sign

Author

R. H. Hardin

Extensions

Extended with signs Mar 1997

Status

approved