-49148domain: ZAppears in sequencesa(n) = 4 - 3*2^n.at n=14A165751A symmetrical triangle sequence: T(n, k) = q^k + q^(n-k) - q^n, with q=4.at n=37A176227A symmetrical triangle sequence: T(n, k) = q^k + q^(n-k) - q^n, with q=4.at n=43A176227