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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 3 |
| 5 | 212 |
| 6 | 10592 |
| 7 | 449977 |
| 8 | 17727425 |
| 9 | 680781219 |
| 10 | 26046238416 |
| 11 | 1001222256515 |
| 12 | 38764377926857 |
| 13 | 1511202832516487 |
[0,0,0,0,3,212,10592,449977,17727425,680781219, 26046238416,1001222256515,38764377926857, 1511202832516487] |