E.g.f. A(x) satisfies: A( tan( A(x) ) ) = tanh(x).

A279839

E.g.f. A(x) satisfies: A( tan( A(x) ) ) = tanh(x).

Terms

    a(0) =1a(1) =-2a(2) =20a(3) =-496a(4) =23120a(5) =-1747360a(6) =195269568a(7) =-30288321792

External references