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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 20 |
| 3 | 300 |
| 4 | 4000 |
| 5 | 50000 |
| 6 | 600000 |
| 7 | 7000000 |
| 8 | 80000000 |
| 9 | 900000000 |
| 10 | 9100000000 |
| 11 | 90200000000 |
| 12 | 930000000000 |
| 13 | 9201010000000 |
| 14 | 94010000000000 |
| 15 | 960000000000000 |
| 16 | 9700000000000000 |
| 17 | 97000000001000000 |
| 18 | 990000000000000000 |
[1,20,300,4000,50000,600000,7000000,80000000, 900000000,9100000000,90200000000,930000000000, 9201010000000,94010000000000,960000000000000, 9700000000000000,97000000001000000, 990000000000000000] |