Base 7 digits are, in order, the first n terms of the periodic sequence with initial period 1,2,1.

A037540

Base 7 digits are, in order, the first n terms of the periodic sequence with initial period 1,2,1.

Terms

    a(0) =1a(1) =9a(2) =64a(3) =449a(4) =3145a(5) =22016a(6) =154113a(7) =1078793a(8) =7551552a(9) =52860865a(10) =370026057a(11) =2590182400a(12) =18131276801a(13) =126918937609a(14) =888432563264

External references