The n-th derivative of exp(2*arctan(x) - Pi/2), evaluated at x=1.

A189772

The n-th derivative of exp(2*arctan(x) - Pi/2), evaluated at x=1.

Terms

    a(0) =1a(1) =1a(2) =0a(3) =-1a(4) =2a(5) =0a(6) =-20a(7) =100a(8) =-180a(9) =-1540a(10) =18800a(11) =-99900a(12) =-35000a(13) =6978400a(14) =-81010800a(15) =418106000a(16) =2652650000a(17) =-89962470000

External references