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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 104 |
| 3 | 1840 |
| 4 | 59720 |
| 5 | 3026432 |
| 6 | 264604776 |
| 7 | 35582947920 |
| 8 | 8132915749352 |
| 9 | 2989994168957168 |
[0,104,1840,59720,3026432,264604776,35582947920, 8132915749352,2989994168957168] |