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

Terms

a(0) =1a(1) =0a(2) =1a(3) =-6a(4) =41a(5) =-335a(6) =3229a(7) =-36036a(8) =457932a(9) =-6534384a(10) =103499016a(11) =-1802302128a(12) =34227784920a(13) =-704076488232