1216380domain: NAppears in sequencesNumber of matchings in graph C_{12} X P_{n}.at n=2A033524G.f.: 2*x*(2-2*x-3*x^2+2*x^3)/((1-3*x-x^2+x^3)*(1-x)).at n=12A061703Number of matchings in the C_n X P_2 (n-prism) graph.at n=11A102080