supported by National Natural Science Foundation of China(Grant No.11071163);Specialized Research Fund for the Doctoral Program of Higher Education(Grant No.20110073120068);Education Department of Henan Province(Grant No.14A110026)
In this paper, a bivariate generating function CF(x, y) =f(x)-yf(xy)1-yis investigated, where f(x)= n 0fnxnis a generating function satisfying the functional equation f(x) = 1 + r j=1 m i=j-1aij xif(x)j.In particular,...