0,1

This sequence is also decimal expansion of cosine of 50 degrees. - Mohammad K. Azarian, Jun 29 2013

A sextic number with denominator 2. - Charles R Greathouse IV, Nov 05 2017

Ivan Panchenko, Table of n, a(n) for n = 0..1000

Equals cos(5*pi/18) = 2F1(11/12,1/12;1/2;3/4) / 2 . - R. J. Mathar, Oct 27 2008

RealDigits[ Sin[ 2Pi/9], 10, 111][[1]] (* Robert G. Wilson v *)

RealDigits[Sin[40 Degree], 10, 120][[1]] (* Harvey P. Dale, Mar 27 2015 *)

(PARI) sin(2/9*Pi) \\ Charles R Greathouse IV, Nov 05 2017

Sequence in context: A145011 A173625 A086036 * A244685 A118421 A158233

Adjacent sequences: A019846 A019847 A019848 * A019850 A019851 A019852

nonn,cons

N. J. A. Sloane.

approved