Expansion of e.g.f.: sin(tanh(log(1+x))).

Terms

a(0) =0a(1) =1a(2) =-1a(3) =-1a(4) =12a(5) =-44a(6) =0a(7) =1364a(8) =-11312a(9) =34588a(10) =378900a(11) =-7237396a(12) =57785376a(13) =-13438424a(14) =-7111845832a(15) =116461238984a(16) =-835329363840