E.g.f. exp(x/cosh(x)).

Terms

a(0) =1a(1) =1a(2) =1a(3) =-2a(4) =-11a(5) =-4a(6) =181a(7) =624a(8) =-3863a(9) =-37808a(10) =66121a(11) =2529440a(12) =4478365a(13) =-197245632a(14) =-1211701763a(15) =17275207936a(16) =226423491793