A081549 a(1) = 1; for n > 1, a(n) > a(n-1) is the smallest number such that the concatenation a(1)a(2)a(3)...forms a cyclic concatenation of 123456789 (of nonzero digits).

1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 34, 56, 78, 91, 234, 567, 891, 2345, 6789, 12345, 67891, 234567, 891234, 5678912, 34567891, 234567891, 2345678912, 3456789123, 4567891234, 5678912345, 6789123456, 7891234567, 8912345678, 9123456789