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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 98 |
| 3 | 3234 |
| 4 | 149784 |
| 5 | 8927880 |
| 6 | 650696400 |
| 7 | 56061791856 |
| 8 | 5574017768832 |
| 9 | 628158472212096 |
| 10 | 79123082415148800 |
| 11 | 11015976349601752320 |
| 12 | 1679832851707998600192 |
| 13 | 278440504042352431942656 |
| 14 | 49846084962712218734045184 |
| 15 | 9584526091509128369970432000 |
| 16 | 1970059291620925696814892810240 |
[1,5,98,3234,149784,8927880,650696400,56061791856, 5574017768832,628158472212096,79123082415148800, 11015976349601752320,1679832851707998600192, 278440504042352431942656, 49846084962712218734045184, 9584526091509128369970432000, 1970059291620925696814892810240] |