Expansion of e.g.f. exp(arctan(x)/exp(x)).

Terms

a(0) =1a(1) =1a(2) =-1a(3) =-4a(4) =9a(5) =60a(6) =-175a(7) =-2154a(8) =6433a(9) =140984a(10) =-404063a(11) =-14300174a(12) =38333361a(13) =2070386084a(14) =-5007071823a(15) =-406148697538a(16) =844312637249