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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 8 |
| 4 | 135 |
| 5 | 3386 |
| 6 | 120469 |
| 7 | 5767884 |
| 8 | 357666403 |
| 9 | 27886211102 |
| 10 | 2670067220337 |
| 11 | 308003491726640 |
| 12 | 42129829536116671 |
| 13 | 6742323657098884098 |
| 14 | 1248097176923675241805 |
| 15 | 264614795104954119229076 |
[0,1,8,135,3386,120469,5767884,357666403, 27886211102,2670067220337,308003491726640, 42129829536116671,6742323657098884098, 1248097176923675241805,264614795104954119229076] |