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0,2
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Table of n, a(n) for n=0..5.
Jeffrey Shallit, Predictable regular continued cotangent expansions, J. Res. Nat. Bur. Standards Sect. B 80B (1976), no. 2, 285-290.
For numerators see A002814.
Sequence in context: A156908 A182517 A135866 * A139888 A079594 A089922
Adjacent sequences: A006267 A006268 A006269 * A006271 A006272 A006273
nonn
N. J. A. Sloane.
approved