469981domain: NAppears in sequencesNumber of edge covers in the ladder graph P_2 x P_n.at n=7A286911Array read by antidiagonals: T(m,n) = number of edge covers in the grid graph P_m X P_n.at n=37A286912Array read by antidiagonals: T(m,n) = number of edge covers in the grid graph P_m X P_n.at n=43A286912