158631825968domain: NAppears in sequencesa(n) = 4*a(n-1) - a(n-2), with a(0) = 0, a(1) = 2.at n=20A052530a(n) = 14*a(n-1) - a(n-2); a(0) = 0, a(1) = 8.at n=10A067900