Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 1,2.

A037487

Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 1,2.

Terms

    a(0) =1a(1) =12a(2) =121a(3) =1212a(4) =12121a(5) =121212a(6) =1212121a(7) =12121212a(8) =121212121a(9) =1212121212a(10) =12121212121a(11) =121212121212

External references