a(n) = 5^n*Lucas(n), where Lucas = A000204.

A127212

a(n) = 5^n*Lucas(n), where Lucas = A000204.

Terms

    a(0) =5a(1) =75a(2) =500a(3) =4375a(4) =34375a(5) =281250a(6) =2265625a(7) =18359375a(8) =148437500a(9) =1201171875a(10) =9716796875a(11) =78613281250a(12) =635986328125

External references