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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 63 |
| 3 | 765 |
| 4 | 26003 |
| 5 | 559115 |
| 6 | 16513425 |
| 7 | 435630965 |
| 8 | 12576072219 |
| 9 | 355197660509 |
| 10 | 10318921933459 |
| 11 | 299385686951737 |
| 12 | 8776646594694357 |
| 13 | 257891661687979323 |
| 14 | 7614010950576116449 |
| 15 | 225337048658653360699 |
| 16 | 6687122593012508859001 |
[1,63,765,26003,559115,16513425,435630965, 12576072219,355197660509,10318921933459, 299385686951737,8776646594694357, 257891661687979323,7614010950576116449, 225337048658653360699,6687122593012508859001] |