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| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 256 |
| 3 | 1644 |
| 4 | 9999 |
| 5 | 67396 |
| 6 | 422541 |
| 7 | 2563359 |
| 8 | 15730896 |
| 9 | 96081144 |
| 10 | 582174000 |
| 11 | 3527156073 |
| 12 | 21366154944 |
| 13 | 129224742827 |
| 14 | 781136134575 |
| 15 | 4721445779732 |
| 16 | 28529589334000 |
| 17 | 172355128544728 |
| 18 | 1041178745668425 |
| 19 | 6289245172035000 |
[16,256,1644,9999,67396,422541,2563359,15730896, 96081144,582174000,3527156073,21366154944, 129224742827,781136134575,4721445779732, 28529589334000,172355128544728,1041178745668425, 6289245172035000] |