Coefficient of x^(4*n+2) in e.g.f. arcsinh(cos(x) - cosh(x)).

A013476

Coefficient of x^(4*n+2) in e.g.f. arcsinh(cos(x) - cosh(x)).

Terms

    a(0) =-2a(1) =118a(2) =-267122a(3) =3801437638

External references