Numerators of sequence having sqrt(cos(x)) as e.g.f. (even-indexed coefficients only).

A008990

Numerators of sequence having sqrt(cos(x)) as e.g.f. (even-indexed coefficients only).

Terms

    a(0) =1a(1) =-1a(2) =-1a(3) =-19a(4) =-559a(5) =-29161a(6) =-2368081a(7) =-276580459a(8) =-43947282079

External references