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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 37 |
| 8 | 893 |
| 9 | 18152 |
| 10 | 340829 |
| 11 | 6177089 |
| 12 | 110675964 |
| 13 | 1988334936 |
| 14 | 36138726192 |
| 15 | 668508463219 |
[1,37,893,18152,340829,6177089,110675964, 1988334936,36138726192,668508463219] |