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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 32 |
| 3 | 8072 |
| 4 | 2764070 |
| 5 | 804371949 |
| 6 | 240257613761 |
| 7 | 72063803799931 |
| 8 | 21695654478885490 |
[0,32,8072,2764070,804371949,240257613761, 72063803799931,21695654478885490] |