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We present an explicit formula for the transition matrix $\mathcal{C}$ fromthe type $C_n$ degeneration of the Koornwinder polynomials$P_{(1^r)}(x\,|\,a,-a,c,-c\,|\,q,t)$ with one column diagrams, to the type$C_n$ monomial symmetric polynomials $m_{(1^{r})}(x)$. The entries of thematrix $\mathcal{C}$ enjoy a set of three term recursion relations, which canbe regarded as a $(a,c,t)$-deformation of the one for the Catalan triangle orballot numbers. Some transition matrices are studied associated with the type$(C_n,C_n)$ Macdonald polynomials $P^{(C_n,C_n)}_{(1^r)}(x\,|\,b;q,t)=P_{(1^r)}\big(x\,|\,b^{1/2},-b^{1/2},q^{1/2}b^{1/2},-q^{1/2}b^{1/2}\,|\,q,t\big)$.It is also shown that the $q$-ballot numbers appear as the Kostka polynomials,namely in the transition matrix from the Schur polynomials$P^{(C_n,C_n)}_{(1^r)}(x\,|\,q;q,q)$ to the Hall-Littlewood polynomials$P^{(C_n,C_n)}_{(1^r)}(x\,|\,t;0,t)$.

Macdonald Polynomials of Type $C_n$ with One-Column Diagrams and Deformed Catalan Numbers