Expansion of e.g.f. tanh(exp(x) - sec(x)).

Terms

a(0) =0a(1) =1a(2) =0a(3) =-1a(4) =-4a(5) =-3a(6) =60a(7) =107a(8) =-264a(9) =-11175a(10) =-40200a(11) =142903a(12) =2392436a(13) =8175637a(14) =-327277132a(15) =-3256146845a(16) =-19824913424a(17) =184016913969