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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 56 |
| 4 | 2146 |
| 5 | 41931 |
| 6 | 547197 |
| 7 | 5219491 |
| 8 | 39260363 |
| 9 | 247768745 |
| 10 | 1379016025 |
| 11 | 7040775017 |
[0,1,56,2146,41931,547197,5219491,39260363, 247768745,1379016025,7040775017] |