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| n | a(n) |
|---|---|
| 1 | 54 |
| 2 | 396 |
| 3 | 5184 |
| 4 | 420654 |
| 5 | 14762016 |
| 6 | 661066920 |
| 7 | 35819485902 |
| 8 | 1848763876932 |
| 9 | 97674093333720 |
| 10 | 5273363053187598 |
| 11 | 283250082728896200 |
| 12 | 15255186777350855280 |
| 13 | 823762481842229569614 |
| 14 | 44454274055540034471036 |
| 15 | 2399751878355335217728304 |
[54,396,5184,420654,14762016,661066920, 35819485902,1848763876932,97674093333720, 5273363053187598,283250082728896200, 15255186777350855280,823762481842229569614, 44454274055540034471036,2399751878355335217728304] |