a(n+1) = a(n) converted to base 5 from base 4 (written in base 10).

Terms

a(0) =4a(1) =5a(2) =6a(3) =7a(4) =8a(5) =10a(6) =12a(7) =15a(8) =18a(9) =27a(10) =38a(11) =57a(12) =86a(13) =157a(14) =291a(15) =678a(16) =1557a(17) =4406a(18) =16332a(19) =58515a(20) =269028a(21) =1976680a(22) =16444560a(23) =180744025a(24) =3078792661a(25) =81397457281