Expansion of e.g.f. log(1 + arctan(x)*arctanh(x)) (even powers only).

A296623

Expansion of e.g.f. log(1 + arctan(x)*arctanh(x)) (even powers only).

Terms

    a(0) =0a(1) =2a(2) =-12a(3) =448a(4) =-21728a(5) =2380032a(6) =-318185472a(7) =69695846400

External references