16 in base 16-n.

Terms

a(0) =10a(1) =11a(2) =12a(3) =13a(4) =14a(5) =15a(6) =16a(7) =17a(8) =20a(9) =22a(10) =24a(11) =31a(12) =100a(13) =121a(14) =10000