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

A013471

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

Terms

    a(0) =2a(1) =122a(2) =277202a(3) =3983059082

External references