896848domain: NAppears in sequencesa(n) = 8^n-7^n-6^n-5^n-4^n-3^n-2^n-1.at n=7A147979a(n) = n^(n-1) - (n-1)^(n-1) - ... - 2^(n-1) - 1^(n-1).at n=7A191686