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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 16 |
| 3 | 251 |
| 4 | 14491 |
| 5 | 1730861 |
| 6 | 373486525 |
| 7 | 128038522439 |
| 8 | 65551419139302 |
| 9 | 47785761199635528 |
| 10 | 47785253957386480534 |
| 11 | 63601854214623350663136 |
| 12 | 109903723926415382728069729 |
| 13 | 241458148813601665905147070195 |
[1,16,251,14491,1730861,373486525,128038522439, 65551419139302,47785761199635528, 47785253957386480534,63601854214623350663136, 109903723926415382728069729, 241458148813601665905147070195] |