A009742 Expansion of tan(x)*sin(tan(x)).

0, 2, 12, 118, 536, -116246, -16364252, -2126232482, -306170653648, -50385573229614, -9466502482856388, -2005520046878244794, -469486134481963893176, -117587958866855549958726

Offset

0,2

Links

Table of n, a(n) for n=0..13.

Mathematica

Tan[ x ]*Sin[ Tan[ x ] ] (* Even Part *)
nn = 20; Table[(CoefficientList[Series[Sin[Tan[x]]*Tan[x], {x, 0, 2*nn}], x] * Range[0, 2*nn]!)[[n]], {n, 1, 2*nn+1, 2}] (* Vaclav Kotesovec, Jan 24 2015 *)

Crossrefs

Sequence in context: A290840 A012628 A012623 * A279201 A121425 A132692

Adjacent sequences: A009739 A009740 A009741 * A009743 A009744 A009745

Keyword

sign

Author

R. H. Hardin

Extensions

Extended with signs by Olivier Gérard, Mar 15 1997

Status

approved