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

Terms

a(0) =1a(1) =0a(2) =1a(3) =-3a(4) =16a(5) =-100a(6) =736a(7) =-6216a(8) =59284a(9) =-630288a(10) =7391836a(11) =-94796020a(12) =1319653336a(13) =-19816887168a(14) =319274039176