E.g.f. 1-sqrt(cos(2*x)) (even part).

A192063

E.g.f. 1-sqrt(cos(2*x)) (even part).

Terms

    a(0) =0a(1) =2a(2) =4a(3) =152a(4) =8944a(5) =933152a(6) =151557184a(7) =35402298752

External references