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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 61 |
| 3 | 628 |
| 4 | 5663 |
| 5 | 51862 |
| 6 | 486305 |
| 7 | 4532025 |
| 8 | 42210111 |
| 9 | 393354513 |
| 10 | 3665540260 |
| 11 | 34156287528 |
| 12 | 318279356683 |
| 13 | 2965838291898 |
| 14 | 27636672383375 |
| 15 | 257527745652155 |
| 16 | 2399729999704478 |
| 17 | 22361489149827987 |
| 18 | 208371854494502461 |
[2,61,628,5663,51862,486305,4532025,42210111, 393354513,3665540260,34156287528,318279356683, 2965838291898,27636672383375,257527745652155, 2399729999704478,22361489149827987, 208371854494502461] |