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

A037543

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

Terms

    a(0) =1a(1) =12a(2) =121a(3) =1211a(4) =12112a(5) =121121a(6) =1211211a(7) =12112112a(8) =121121121a(9) =1211211211a(10) =12112112112a(11) =121121121121

External references