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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 3 |
| 3 | 49 |
| 4 | 1401 |
| 5 | 106803 |
| 6 | 19457754 |
| 7 | 7600681910 |
| 8 | 7516309079483 |
| 9 | 16637614325062889 |
[0,3,49,1401,106803,19457754,7600681910, 7516309079483,16637614325062889] |