%I #6 Jun 10 2018 08:01:37
%S 1,1,1,1,1,1,1,1,1,1,1,1,5,1,1,1,1,5,1,1,1,1,25,1,1,1,1,25,1,1,1,1,
%T 125,1,1,1,1,125,1,1,1,1,625,1,1,1,1,625,1,1,1,1,15625,1,1,1,1,15625,
%U 1,1,1,1,78125,1,1,1,1,78125,1,1,1,1,390625,1,1,1,1,390625,1,1,1,1,1953125,1
%N Denominators of expansion of eta(5t)^2*eta(10t)^(13/5)*eta(20t)^(-9/5)*eta(40t)^(6/5).
%H T. Ishikawa, <a href="http://projecteuclid.org/euclid.hmj/1206128505">Congruences between binomial coefficients binom(2f,f) and Fourier coefficients of certain eta-products</a>, Hiroshima Math. J. 22 (1992), no. 3, 583-590.
%e q^2-2*q^7-18/5*q^12+36/5*q^17+122/25*q^22-144/25*q^27-...
%Y Cf. A135468 (numerators)
%K nonn,frac
%O 2,13
%A _N. J. A. Sloane_, Feb 07 2008