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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 3 |
| 3 | 412 |
| 4 | 50080 |
| 5 | 6016512 |
| 6 | 722051072 |
| 7 | 86646800384 |
| 8 | 10397622337536 |
| 9 | 1247714738176000 |
| 10 | 149725769101213696 |
| 11 | 17967092296776155136 |
| 12 | 2156051075653940805632 |
| 13 | 258726129078829378961408 |
| 14 | 31047135489462617851822080 |
| 15 | 3725656258735540805375623168 |
| 16 | 447078751048265125343493357568 |
[0,3,412,50080,6016512,722051072,86646800384, 10397622337536,1247714738176000, 149725769101213696,17967092296776155136, 2156051075653940805632,258726129078829378961408, 31047135489462617851822080, 3725656258735540805375623168, 447078751048265125343493357568] |