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A084329 as a simple table
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 20 |
| 3 | 380 |
| 4 | 7200 |
| 5 | 136400 |
| 6 | 2584000 |
| 7 | 48952000 |
| 8 | 927360000 |
| 9 | 17568160000 |
| 10 | 332816000000 |
| 11 | 6304956800000 |
| 12 | 119442816000000 |
| 13 | 2262757184000000 |
| 14 | 42866287360000000 |
| 15 | 812070603520000000 |
| 16 | 15384086323200000000 |
[0,1,20,380,7200,136400,2584000,48952000, 927360000,17568160000,332816000000,6304956800000, 119442816000000,2262757184000000, 42866287360000000,812070603520000000, 15384086323200000000] |