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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 120 |
| 2 | 38966400 |
| 3 | 335872728576000 |
| 4 | 23676862831649280000000 |
| 5 | 7884265450248813494550528000000 |
| 6 | 9001018126678397460727568113336320000000 |
| 7 | 28542885018291526761600709316931461578752000000000 |
| 8 | 216619327660243309425808505300579182909935738421248000000000 |
[1,120,38966400,335872728576000, 23676862831649280000000, 7884265450248813494550528000000, 9001018126678397460727568113336320000000, 28542885018291526761600709316931461578752000000000\ , 21661932766024330942580850530057918290993573842124\ 8000000000] |