E.g.f.: exp(tanh(x)/cos(x)).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =32a(6) =157a(7) =688a(8) =3817a(9) =29952a(10) =257049a(11) =1922560a(12) =15886125a(13) =160364544a(14) =1844058101a(15) =19815696384a(16) =218349214545