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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 26 |
| 3 | 25435 |
| 4 | 53890394 |
| 5 | 351689776895 |
| 6 | 8191570949391204 |
| 7 | 721612821437109284511 |
| 8 | 247946490679458336910844453 |
[0,26,25435,53890394,351689776895, 8191570949391204,721612821437109284511, 247946490679458336910844453] |