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

A037556

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

Terms

    a(0) =2a(1) =15a(2) =106a(3) =744a(4) =5209a(5) =36464a(6) =255250a(7) =1786751a(8) =12507258a(9) =87550808a(10) =612855657a(11) =4289989600a(12) =30029927202a(13) =210209490415

External references