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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 6 |
| 6 | 8 |
| 7 | 583 |
| 8 | 6393 |
| 9 | 9715 |
| 10 | 33288 |
| 11 | 50011 |
| 12 | 126113 |
| 13 | 31172165 |
[0,1,2,3,6,8,583,6393,9715,33288,50011,126113, 31172165] |