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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 23 |
| 3 | 307 |
| 4 | 4489 |
| 5 | 50021 |
| 6 | 600007 |
| 7 | 7000003 |
| 8 | 80062991 |
| 9 | 900660121 |
| 10 | 1000000006 |
| 11 | 11000000021 |
| 12 | 120000000004 |
| 13 | 1300000000021 |
| 14 | 14000000000001 |
| 15 | 150000000000017 |
| 16 | 1604502443050081 |
| 17 | 17000000000000009 |
| 18 | 180000000000000027 |
[1,23,307,4489,50021,600007,7000003,80062991, 900660121,1000000006,11000000021,120000000004, 1300000000021,14000000000001,150000000000017, 1604502443050081,17000000000000009, 180000000000000027] |