Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 2,1,3,0.

A037743

Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 2,1,3,0.

Terms

    a(0) =2a(1) =21a(2) =213a(3) =2130a(4) =21302a(5) =213021a(6) =2130213a(7) =21302130a(8) =213021302a(9) =2130213021a(10) =21302130213a(11) =213021302130

External references