Expansion of tan(tan(log(1+x))).

Terms

a(0) =0a(1) =1a(2) =-1a(3) =6a(4) =-30a(5) =236a(6) =-2100a(7) =22712a(8) =-279776a(9) =3914264a(10) =-60987960a(11) =1048837952a(12) =-19714584912a(13) =402125014864