a(n) = 91 written in base 15 - n.

Terms

a(0) =61a(1) =67a(2) =70a(3) =77a(4) =83a(5) =91a(6) =111a(7) =133a(8) =160a(9) =231a(10) =331a(11) =1123a(12) =10101a(13) =1011011