A115184 Denominator of coefficient of x^(2n-1) in series of 3*sin(x)/(2+cos(x)).

1, 1, 180, 1512, 25920, 3991680, 849139200, 4311014400, 1600593426432000, 2146678242508800, 576213633515520000, 423033001181754163200, 3034801964999540736000000, 1329532289428370227200000

Offset

1,3

Links

Table of n, a(n) for n=1..14.

Eric Weisstein's World of Mathematics, Identity Function

Example

x - x^5/180 - x^7/1512 - x^9/25920 + x^11/3991680 + (269*x^13)/849139200 + ...

Mathematica

Denominator[ CoefficientList[ Series[3Sin[x]/(2 + Cos[x]), {x, 0, 29}], x]] [[2Range@14]] (* Robert G. Wilson v, Jan 21 2006 *)

Crossrefs

Cf. A115183.

Sequence in context: A225932 A081380 A395662 * A154672 A211556 A364162

Adjacent sequences: A115181 A115182 A115183 * A115185 A115186 A115187

Keyword

nonn,frac

Author

Eric W. Weisstein, Jan 15 2006

Status

approved