a(0) = a(1) = 1; a(n) = 5*a(n-1) + 5*a(n-2).

Terms

a(0) =1a(1) =1a(2) =10a(3) =55a(4) =325a(5) =1900a(6) =11125a(7) =65125a(8) =381250a(9) =2231875a(10) =13065625a(11) =76487500a(12) =447765625a(13) =2621265625a(14) =15345156250a(15) =89832109375a(16) =525886328125