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Ivan Panchenko, Table of n, a(n) for n = 0..1000
Wikipedia, Exact trigonometric constants, Wikipedia
Sequence in context: A196402 A004493 A170929 * A020503 A071992 A174984
Adjacent sequences: A019833 A019834 A019835 * A019837 A019838 A019839
N. J. A. Sloane.