“…The nonlinear Euler sums, i.e., S π,q with π having two or more parts, are more complicated. Such sums were already considered in [3,23,43,46,47,49,51,52]. In [23], Flajolet and Salvy gave an algorithm for reducing S π 1 π 2 ,q to linear Euler sums when π 1 + π 2 + q is even and π 1 , π 2 , q > 1 (see Theorem 4.2 in the reference [23].…”