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

Terms

a(0) =0a(1) =1a(2) =-1a(3) =4a(4) =-18a(5) =106a(6) =-750a(7) =6196a(8) =-58408a(9) =617716a(10) =-7234020a(11) =92842696a(12) =-1294948776a(13) =19493497024a(14) =-314874396928