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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 720 |
| 7 | 4656 |
| 8 | 32952 |
| 9 | 262464 |
| 10 | 2379072 |
| 11 | 21819048 |
| 12 | 230467552 |
| 13 | 2657778688 |
| 14 | 31820272200 |
| 15 | 412752172838 |
| 16 | 5776743687880 |
[1,2,6,24,120,720,4656,32952,262464,2379072, 21819048,230467552,2657778688,31820272200, 412752172838,5776743687880] |