627960domain: NAppears in sequencesNumber of matchings in graph C_{3} X P_{n}.at n=7A033515Array read by antidiagonals: T(m,n) is the number of matchings in the stacked prism graph C_m X P_n.at n=38A287428Number of chiral pairs of color patterns (set partitions) in a cycle of length n using exactly 3 colors (subsets).at n=16A320643