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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 23 |
| 3 | 457 |
| 4 | 891011 |
| 5 | 1213141516 |
| 6 | 171819202122 |
| 7 | 23242526272930 |
| 8 | 3132333435363738 |
| 9 | 394041424344454647 |
| 10 | 48495051525354555657 |
| 11 | 5859606162636465666768 |
| 12 | 697071727374757677787980 |
[1,23,457,891011,1213141516,171819202122, 23242526272930,3132333435363738, 394041424344454647,48495051525354555657, 5859606162636465666768,697071727374757677787980] |