Expansion of tanh(x)*cos(tan(x)).

A009826

Expansion of tanh(x)*cos(tan(x)).

Terms

    a(0) =1a(1) =-5a(2) =1a(3) =-797a(4) =1345a(5) =-785685a(6) =33807489a(7) =-492925869a(8) =846642059905

External references