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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 32 |
| 3 | 452 |
| 4 | 5031 |
| 5 | 44736 |
| 6 | 344926 |
| 7 | 2706117 |
| 8 | 22404783 |
| 9 | 187497531 |
| 10 | 1518906665 |
| 11 | 11728070120 |
| 12 | 86620862097 |
| 13 | 616844079105 |
| 14 | 4256996307319 |
| 15 | 28523072830335 |
| 16 | 185674613829792 |
| 17 | 1175484129892778 |
| 18 | 7248518396992789 |
| 19 | 43607030016608124 |
[21,32,452,5031,44736,344926,2706117,22404783, 187497531,1518906665,11728070120,86620862097, 616844079105,4256996307319,28523072830335, 185674613829792,1175484129892778,7248518396992789, 43607030016608124] |