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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 66 |
| 3 | 2364 |
| 4 | 465638 |
| 5 | 57701860 |
| 6 | 7659817624 |
| 7 | 1002758638600 |
| 8 | 131716860513628 |
| 9 | 17291570114787190 |
| 10 | 2270220065544544366 |
| 11 | 298053056164828274720 |
| 12 | 39130880089619731153300 |
| 13 | 5137427036124512850789104 |
[0,66,2364,465638,57701860,7659817624, 1002758638600,131716860513628,17291570114787190, 2270220065544544366,298053056164828274720, 39130880089619731153300,5137427036124512850789104] |