E.g.f.: 1 / (exp(2*x) - x).

Terms

a(0) =1a(1) =-1a(2) =-2a(3) =10a(4) =24a(5) =-312a(6) =-560a(7) =19472a(8) =6272a(9) =-1994624a(10) =4072704a(11) =299059968a(12) =-1635814400a(13) =-60723321856a(14) =628215191552