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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 406 |
| 4 | 132724 |
| 5 | 164176640 |
| 6 | 602351808741 |
| 7 | 5562418293759978 |
| 8 | 114601242382721619224 |
| 9 | 4801114002903931560293544 |
| 10 | 379957050243738294456427057200 |
| 11 | 53499490664883668314419655562118240 |
[1,1,7,406,132724,164176640,602351808741, 5562418293759978,114601242382721619224, 4801114002903931560293544, 379957050243738294456427057200, 53499490664883668314419655562118240] |