6375625domain: NAppears in sequencesa(n) = n + n*(n-1)*(n-2)*(n-3)*(n-4).at n=25A001095Numbers k such that k | 9^k + 1.at n=33A015957Number of n X 6 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 1 0 1 vertically.at n=21A207597