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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 115 |
| 4 | 12885 |
| 5 | 7173370 |
| 6 | 19940684251 |
| 7 | 277078842941900 |
| 8 | 19249144351745111125 |
| 9 | 6686277384080730564862875 |
| 10 | 11612516024884420913314995604000 |
| 11 | 100841213012622614260440382077516990500 |
| 12 | 4378443591626306255827149380635713364079323075 |
[1,1,5,115,12885,7173370,19940684251, 277078842941900,19249144351745111125, 6686277384080730564862875, 11612516024884420913314995604000, 100841213012622614260440382077516990500, 4378443591626306255827149380635713364079323075] |