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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 10 |
| 3 | 102 |
| 4 | 1110 |
| 5 | 10010 |
| 6 | 101010 |
| 7 | 1009470 |
| 8 | 11741730 |
| 9 | 223092870 |
| 10 | 6469693230 |
[2,10,102,1110,10010,101010,1009470,11741730, 223092870,6469693230] |