Expansion of e.g.f. arctan(tanh(x) * exp(x)).

Terms

a(0) =0a(1) =1a(2) =2a(3) =-1a(4) =-28a(5) =-115a(6) =422a(7) =10859a(8) =62792a(9) =-658855a(10) =-17714998a(11) =-105832681a(12) =2697504812a(13) =73345212005a(14) =348796937582