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| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 256 |
| 3 | 1644 |
| 4 | 12015 |
| 5 | 97580 |
| 6 | 820820 |
| 7 | 7070805 |
| 8 | 61530000 |
| 9 | 538903800 |
| 10 | 4735474525 |
| 11 | 41696434728 |
| 12 | 367562042568 |
| 13 | 3242398676595 |
| 14 | 28614207114896 |
| 15 | 252584682127428 |
| 16 | 2229968979966475 |
| 17 | 19689354946616388 |
| 18 | 173855783327986060 |
[16,256,1644,12015,97580,820820,7070805,61530000, 538903800,4735474525,41696434728,367562042568, 3242398676595,28614207114896,252584682127428, 2229968979966475,19689354946616388, 173855783327986060] |