a(n) = 5^(2*n + 1).A013710a(n) = 5^(2*n + 1).Terms a(0) =5a(1) =125a(2) =3125a(3) =78125a(4) =1953125a(5) =48828125a(6) =1220703125a(7) =30517578125a(8) =762939453125External referencesoeis: A013710