Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 2,1,3.

A037638

Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 2,1,3.

Terms

    a(0) =2a(1) =21a(2) =213a(3) =2132a(4) =21321a(5) =213213a(6) =2132132a(7) =21321321a(8) =213213213a(9) =2132132132a(10) =21321321321a(11) =213213213213

External references