Expansion of exp(tan(tan(x))).

Terms

a(0) =1a(1) =1a(2) =1a(3) =5a(4) =17a(5) =113a(6) =673a(7) =5669a(8) =48033a(9) =494081a(10) =5387009a(11) =65835109a(12) =871869745a(13) =12394430129a(14) =192177458593