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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 51 |
| 3 | 3391 |
| 4 | 194851 |
| 5 | 13130451 |
| 6 | 950563701 |
| 7 | 71936181801 |
| 8 | 5646492993891 |
| 9 | 455886376926451 |
| 10 | 37642786694586601 |
| 11 | 3165885061421056701 |
| 12 | 270372933455657475301 |
| 13 | 23391570666645297045541 |
| 14 | 2046340229879039857971651 |
[1,51,3391,194851,13130451,950563701,71936181801, 5646492993891,455886376926451,37642786694586601, 3165885061421056701,270372933455657475301, 23391570666645297045541,2046340229879039857971651] |