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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 250 |
| 6 | 54219 |
| 7 | 14697256 |
| 8 | 5713126349 |
| 9 | 3406380649146 |
| 10 | 3235013673306411 |
| 11 | 5006915703789559516 |
| 12 | 12814921349279258614386 |
| 13 | 54759970343589573849950696 |
| 14 | 393147238947490609962950665584 |
| 15 | 4762079888047633609309896734274288 |
[0,0,0,1,250,54219,14697256,5713126349, 3406380649146,3235013673306411, 5006915703789559516,12814921349279258614386, 54759970343589573849950696, 393147238947490609962950665584, 4762079888047633609309896734274288] |