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

Terms

a(0) =0a(1) =1a(2) =-1a(3) =4a(4) =-14a(5) =76a(6) =-472a(7) =3592a(8) =-31600a(9) =317968a(10) =-3600384a(11) =45286528a(12) =-626654976a(13) =9459412288a(14) =-154690373632