-1640168551domain: ZAppears in sequencesa(n) = 5*a(n-1) - 8*a(n-2), with a(0)=0, a(1)=1.at n=21A190969a(n) = 3*a(n-1) - 4*a(n-2) with a(0) = a(1) = 1.at n=31A247560