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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 3969 |
| 3 | 266805 |
| 4 | 137945025 |
| 5 | 43142680647 |
| 6 | 15615593045649 |
| 7 | 5392746297039195 |
| 8 | 1888668174848027049 |
| 9 | 658744922326993528365 |
| 10 | 230036351941714961424609 |
| 11 | 80301571203375381579772923 |
| 12 | 28034704123779041409942781569 |
[0,3969,266805,137945025,43142680647, 15615593045649,5392746297039195, 1888668174848027049,658744922326993528365, 230036351941714961424609, 80301571203375381579772923, 28034704123779041409942781569] |