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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 60 |
| 3 | 2400 |
| 4 | 215424 |
| 5 | 39716352 |
| 6 | 14347238400 |
| 7 | 9902131200000 |
| 8 | 12892284695347200 |
| 9 | 31492802074536050688 |
| 10 | 144165936575856535142400 |
| 11 | 1238327694920559152332800000 |
| 12 | 20010804298085003878056591360000 |
| 13 | 610343933792029827481169622466560000 |
[1,4,60,2400,215424,39716352,14347238400, 9902131200000,12892284695347200, 31492802074536050688,144165936575856535142400, 1238327694920559152332800000, 20010804298085003878056591360000, 610343933792029827481169622466560000] |