A175671 Denominator of [x^(2n)] of the Taylor expansion log(cosec(x)*arctan(x)).

1, 6, 20, 567, 3240, 155925, 8292375, 147349125, 312615903600, 103180488035625, 769328200265625, 316985199315159375, 8682638068197843750, 165206922515800790625, 527010082825404522093750, 39040543480476432234965625, 33712429605969723121012500000, 1968441947987203748028891796875

Offset

0,2

Links

Table of n, a(n) for n=0..17.

Example

-x^2/6 + 3*x^4/20 - 50*x^6/567 + 203*x^8/3240 - 7472*x^10/155925 + ...

Crossrefs

Cf. A012857 (numerators).

Sequence in context: A330825 A280039 A216912 * A222741 A338427 A069257

Adjacent sequences: A175668 A175669 A175670 * A175672 A175673 A175674

Keyword

nonn,frac

Author

R. J. Mathar, Dec 20 2011

Status

approved