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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 2722 |
| 4 | 278758 |
| 5 | 56442770 |
| 6 | 12128733980 |
| 7 | 2336016267460 |
| 8 | 456996951981462 |
| 9 | 90300361357430744 |
| 10 | 17782945733891880724 |
| 11 | 3500020956770127070018 |
| 12 | 689152311809440418420484 |
| 13 | 135697110109352656409210304 |
[0,0,2722,278758,56442770,12128733980, 2336016267460,456996951981462,90300361357430744, 17782945733891880724,3500020956770127070018, 689152311809440418420484, 135697110109352656409210304] |