%I #10 Mar 07 2020 01:52:32
%S 1,3,90,2835,18900,66825,1915538625,127702575,186080895000,
%T 350813659321125,7656647326453125,3018906660144375,
%U 1211517431782539131250,144228265688397515625,564653660170076273671875,84913182070036240111050234375,499921764568178729658131250000
%N Denominators of coefficients in Taylor series for log(tan(x)/x).
%D CRC Standard Mathematical Tables and Formulae, 30th ed. 1996, p. 42.
%H Index entries for <a href="/index/Be#Bernoulli">Bernoulli numbers</a> B(2n)
%F A047685(n)/a(n) = 2^(2n) *(2^(2n-1) -1) *abs(B(2n)) / ((2n)! *n).
%e (1/3)*x^2 + (7/90)*x^4 + (62/2835)*x^6 + (127/18900)*x^8 + (146/66825)*x^10 + ...
%Y Cf. A047685, B(2n)= A027641(2n) / A027642(2n).
%K nonn,easy,frac
%O 0,2
%A _N. J. A. Sloane_