  We present several sequences involving harmonic numbers and the central
binomial coefficients. The calculational technique is consists of a special
summation method that allows, based on proper two-valued integer functions, to
calculate different families of power series which involve odd harmonic numbers
and central binomial coefficients. Furthermore it is shown that based on these
series a new type of nonlinear Euler sums that involve odd harmonic numbers can
be calculated in terms of zeta functions.
