Denominators of partial sums of a series for sqrt(5).

Terms

a(0) =1a(1) =5a(2) =25a(3) =5a(4) =125a(5) =3125a(6) =15625a(7) =78125a(8) =78125a(9) =390625a(10) =9765625a(11) =48828125a(12) =244140625a(13) =244140625a(14) =78125a(15) =6103515625a(16) =30517578125a(17) =152587890625a(18) =152587890625a(19) =762939453125