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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 69 |
| 6 | 3072 |
| 7 | 122833 |
| 8 | 4915726 |
| 9 | 204051186 |
| 10 | 8849413857 |
| 11 | 399736867216 |
| 12 | 18698541563923 |
| 13 | 900653139548828 |
| 14 | 44458651801451163 |
| 15 | 2240500172425946056 |
| 16 | 114922424191743943701 |
| 17 | 5985232324581998309113 |
| 18 | 315879022416448194306768 |
[0,0,0,1,69,3072,122833,4915726,204051186, 8849413857,399736867216,18698541563923, 900653139548828,44458651801451163, 2240500172425946056,114922424191743943701, 5985232324581998309113,315879022416448194306768] |