E.g.f. equals the imaginary part of the i-th iteration of (x + x^2), where i=sqrt(-1).

A179201

E.g.f. equals the imaginary part of the i-th iteration of (x + x^2), where i=sqrt(-1).

Terms

    a(0) =0a(1) =0a(2) =2a(3) =-6a(4) =12a(5) =200a(6) =-6240a(7) =139440a(8) =-2869440a(9) =53386560a(10) =-708048000a(11) =-6667689600

External references