Expansion of log(1+x)*log(1+tan(x))/2.

Terms

a(0) =0a(1) =0a(2) =1a(3) =-3a(4) =15a(5) =-80a(6) =542a(7) =-4158a(8) =37228a(9) =-374592a(10) =4237120a(11) =-53017712a(12) =729890528a(13) =-10957004864a(14) =178355968576