481280domain: NAppears in sequencesNumerators of the BG1[ -5,n] coefficients of the BG1 matrix.at n=7A162443Triangular array read by rows. T(n,k) is the number of square lattice walks that start and end at the origin after 2n steps having k primitive loops; n>=1, 1<=k<=n.at n=25A227997