0,1

This sequence is also decimal expansion of cosine of 57 degrees. - Mohammad K. Azarian, Jun 29 2013

An algebraic number of degree 16 and denominator 2. - Charles R Greathouse IV, Aug 27 2017

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

Wikipedia, Exact trigonometric constants

(PARI) sin(11*Pi/60) \\ Charles R Greathouse IV, Aug 27 2017

Sequence in context: A134206 A134209 A232007 * A244046 A255332 A071419

Adjacent sequences: A019839 A019840 A019841 * A019843 A019844 A019845

nonn,cons

N. J. A. Sloane.

approved