Expansion of e.g.f. exp(tan(sin(x))).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =8a(6) =13a(7) =-64a(8) =-855a(9) =-5632a(10) =-38791a(11) =-205184a(12) =-747539a(13) =-240640a(14) =59637061a(15) =859820032a(16) =9421489105a(17) =90170851328a(18) =573991066225