A202602 Denominator of the coefficient of [x^(2n)] of the Taylor series log(cosec(x)*arctanh(x)).

2, 20, 45, 3240, 42525, 8292375, 1915538625, 312615903600, 488462349375, 769328200265625, 96473756313309375, 8682638068197843750, 9086380738369043484375, 527010082825404522093750, 5081882941530686463046875, 33712429605969723121012500000, 21652861427859241228317809765625

Offset

1,1

Links

Table of n, a(n) for n=1..17.

Example

x^2/2 + 3*x^4/20 + 4*x^6/45 + 203*x^8/3240 + 2038*x^10/42525 + ...

Crossrefs

Cf. A012861 (numerators).

Sequence in context: A077541 A266842 A254542 * A390454 A097652 A261838

Adjacent sequences: A202599 A202600 A202601 * A202603 A202604 A202605

Keyword

nonn,frac

Author

R. J. Mathar, Dec 21 2011

Status

approved