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This sequence is also decimal expansion of cosine of 57 degrees. - Mohammad K. Azarian, Jun 29 2013
Ivan Panchenko, Table of n, a(n) for n = 0..1000
Wikipedia, Exact trigonometric constants
Sequence in context: A134206 A134209 A232007 * A244046 A255332 A071419
Adjacent sequences: A019839 A019840 A019841 * A019843 A019844 A019845
N. J. A. Sloane.