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| n | a(n) |
|---|---|
| 21 | 3 |
| 22 | 66 |
| 23 | 1518 |
| 24 | 36432 |
| 25 | 910800 |
| 26 | 23680800 |
| 27 | 639381600 |
| 28 | 17902684800 |
| 29 | 519177859200 |
| 30 | 15575335776000 |
| 31 | 482835409056000 |
| 32 | 15450733089792000 |
| 33 | 509874191963136000 |
| 34 | 17335722526746624000 |
| 35 | 606750288436131840000 |
| 36 | 21843010383700746240000 |
[3,66,1518,36432,910800,23680800,639381600, 17902684800,519177859200,15575335776000, 482835409056000,15450733089792000, 509874191963136000,17335722526746624000, 606750288436131840000,21843010383700746240000] |