21831429421domain: NAppears in sequencesa(n) = 5*a(n-2) - 2*a(n-4), with initial terms 0,1,1,3.at n=33A005824a(n) = 5*a(n-1) - 2*a(n-2) for n>1, with a(0) = 1, a(1) = 3.at n=16A052984