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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 60 |
| 3 | 3600 |
| 4 | 54720 |
| 5 | 831744 |
| 6 | 16066704 |
| 7 | 310358689 |
| 8 | 5669414855 |
| 9 | 103564894225 |
| 10 | 1897896238940 |
| 11 | 34780223170576 |
| 12 | 635711773067072 |
| 13 | 11619518840752384 |
| 14 | 212144954220192048 |
| 15 | 3873265512788926881 |
| 16 | 70687878202585153191 |
[1,60,3600,54720,831744,16066704,310358689, 5669414855,103564894225,1897896238940, 34780223170576,635711773067072,11619518840752384, 212144954220192048,3873265512788926881, 70687878202585153191] |