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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 13 |
| 3 | 216 |
| 4 | 4578 |
| 5 | 119525 |
| 6 | 3729451 |
| 7 | 135771160 |
| 8 | 5658574916 |
| 9 | 265921407297 |
| 10 | 13918657338925 |
| 11 | 803220053336096 |
| 12 | 50674352524725590 |
| 13 | 3470170166345203477 |
| 14 | 256369124879898560271 |
| 15 | 20325382637400264402000 |
[1,13,216,4578,119525,3729451,135771160, 5658574916,265921407297,13918657338925, 803220053336096,50674352524725590, 3470170166345203477,256369124879898560271, 20325382637400264402000] |