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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 73 |
| 5 | 6486 |
| 6 | 1127280 |
| 7 | 455878230 |
| 8 | 457521123971 |
| 9 | 1154811828698984 |
| 10 | 7352963503841306070 |
| 11 | 118143132683839293396707 |
| 12 | 4790379790527104234486857472 |
| 13 | 490170667488489136298923882507851 |
[0,0,0,73,6486,1127280,455878230,457521123971, 1154811828698984,7352963503841306070, 118143132683839293396707, 4790379790527104234486857472, 490170667488489136298923882507851] |