2439844domain: NAppears in sequencesNumber of n X n matrices over GF(5) with rank 1.at n=4A060870Catapolyoctagons (see Cyvin et al. for precise definition).at n=11A121102Array read by ascending antidiagonals: A(n, k) = (k^n - 1)^2/(k - 1), with k >= 2.at n=39A379587