68745613437domain: NAppears in sequencesHoradam sequence (0,1,9,3).at n=16A085504a(n) = 3^(n-1)*Fibonacci(n).at n=17A099012a(n) = 3*a(n-1) + 9*a(n-2) for n > 1, with a(0)=1, a(1)=3.at n=16A122069