where k 1 is the number of kinks, k 2 is the number of medials, and k 3 is the number of terminals in a unit of polyomino chain, by P C n,k . Figure illustrates a general representation of a polyomino chain P C n,k . Let k ≥ 3, by definition of P C n,k , we have: m = 2n, γ = n -1, I {lm=2} = 1, and I {l1=2} = I {k=3} . Hence, in the following corollary, we will compute ZC1(P C n,k ) and ZC2(P C n,k ) for k ≥ 3 using Theorems 1 and 2.