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Ivan Panchenko, Table of n, a(n) for n = 0..1000
Wikipedia, Exact trigonometric constants, Wikipedia
Equals sin(2*Pi/15) = sqrt(1-A019875^2) = 2*A019821*A019887 - R. J. Mathar, Jun 18 2006
Sequence in context: A066760 A102393 A228131 * A155743 A194193 A222889
Adjacent sequences: A019830 A019831 A019832 * A019834 A019835 A019836
N. J. A. Sloane.