a(n) = 60 written in base 15 - n.

Terms

a(0) =40a(1) =44a(2) =48a(3) =50a(4) =55a(5) =60a(6) =66a(7) =74a(8) =114a(9) =140a(10) =220a(11) =330a(12) =2020a(13) =111100