Expansion of e.g.f. cos(tan(log(1+x))).

Terms

a(0) =1a(1) =0a(2) =-1a(3) =3a(4) =-18a(5) =120a(6) =-966a(7) =8946a(8) =-93748a(9) =1094832a(10) =-14078036a(11) =197375420a(12) =-2992213584a(13) =48700300272a(14) =-845573085072