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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 23 |
| 3 | 456 |
| 4 | 78910 |
| 5 | 1112131415 |
| 6 | 161718192021 |
| 7 | 22232425262728 |
| 8 | 2930313233343536 |
| 9 | 373839404142434445 |
| 10 | 46474849505152535455 |
| 11 | 5657585960616263646566 |
| 12 | 676869707172737475767778 |
| 13 | 79808182838485868788899091 |
| 14 | 9293949596979899100101102103104105 |
| 15 | 106107108109110111112113114115116117118119120 |
[1,23,456,78910,1112131415,161718192021, 22232425262728,2930313233343536, 373839404142434445,46474849505152535455, 5657585960616263646566,676869707172737475767778, 79808182838485868788899091, 9293949596979899100101102103104105, 106107108109110111112113114115116117118119120] |