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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 1 |
| 4 | 3 |
| 5 | 8 |
| 6 | 48 |
| 7 | 383 |
| 8 | 6196 |
| 9 | 177083 |
| 10 | 9305118 |
| 11 | 883156024 |
| 12 | 152522187830 |
| 13 | 48322518340547 |
[1,0,1,3,8,48,383,6196,177083,9305118,883156024, 152522187830,48322518340547] |