Blocks of increasing length using 1,2,3,...,9,10; omit leading 0's.

A001369

Blocks of increasing length using 1,2,3,...,9,10; omit leading 0's.

Terms

    a(0) =1a(1) =23a(2) =456a(3) =7891a(4) =1234a(5) =567891a(6) =123456a(7) =78910123a(8) =456789101a(9) =2345678910a(10) =12345678910a(11) =123456789101

External references