  For an even Dirichlet character psi, we obtain a formula for L(1,psi) in
terms of a sum of Dirichlet L-series evaluated at s=2 and s=3 and a rapidly
convergent numerical series involving the central binomial coefficients. We
then derive a class number formula for real quadratic number fields by taking
L(s,psi) to be the quadratic L-series associated with these fields.
