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

A037519

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

Terms

    a(0) =2a(1) =20a(2) =201a(3) =2012a(4) =20120a(5) =201201a(6) =2012012a(7) =20120120a(8) =201201201a(9) =2012012012a(10) =20120120120a(11) =201201201201

External references