Reversion of g.f. for Euler numbers A000111(n-1).

Terms

a(0) =1a(1) =-1a(2) =1a(3) =-2a(4) =3a(5) =-9a(6) =9a(7) =-71a(8) =-96a(9) =-1325a(10) =-6843a(11) =-54922a(12) =-417975a(13) =-3586117a(14) =-32531983a(15) =-316599861a(16) =-3274076017a(17) =-35914014266a(18) =-416386323306