89467563domain: NAppears in sequencesNumber of Barlow packings with group P3(bar)m1(O) that repeat after 2n layers.at n=25A011952Number of n X n matrices over GF(4) with rank 1.at n=6A060869Array read by ascending antidiagonals: A(n, k) = (k^n - 1)^2/(k - 1), with k >= 2.at n=47A379587