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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 441 |
| 3 | 5840 |
| 4 | 57387 |
| 5 | 495985 |
| 6 | 4231138 |
| 7 | 37433596 |
| 8 | 342170839 |
| 9 | 3178789749 |
| 10 | 29672959682 |
| 11 | 277160393375 |
| 12 | 2589242347971 |
| 13 | 24204240827093 |
| 14 | 226449704878547 |
| 15 | 2120085885822119 |
| 16 | 19857888410207651 |
| 17 | 186050078426398273 |
[21,441,5840,57387,495985,4231138,37433596, 342170839,3178789749,29672959682,277160393375, 2589242347971,24204240827093,226449704878547, 2120085885822119,19857888410207651, 186050078426398273] |