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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 86 |
| 6 | 4701 |
| 7 | 378116 |
| 8 | 41728537 |
| 9 | 5954780104 |
| 10 | 1062483996748 |
| 11 | 231414064262143 |
[1,0,0,1,86,4701,378116,41728537,5954780104, 1062483996748,231414064262143] |