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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 85 |
| 4 | 5535 |
| 5 | 1422815 |
| 6 | 1458410395 |
| 7 | 5975113492155 |
| 8 | 97902240525033630 |
| 9 | 6416219161308006188750 |
| 10 | 1681979772433159156954845846 |
| 11 | 1763685303864317080584539713676102 |
| 12 | 7397434088431352859937186709876628421294 |
[1,1,5,85,5535,1422815,1458410395,5975113492155, 97902240525033630,6416219161308006188750, 1681979772433159156954845846, 1763685303864317080584539713676102, 7397434088431352859937186709876628421294] |