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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 36 |
| 7 | 861 |
| 8 | 17296 |
| 9 | 316251 |
| 10 | 5461512 |
| 11 | 90858768 |
| 12 | 1473109704 |
| 13 | 23446881315 |
| 14 | 368136785016 |
| 15 | 5720645481903 |
| 16 | 88188515933856 |
| 17 | 1350990969850340 |
| 18 | 20592957740312160 |
| 19 | 312629484400483356 |
| 20 | 4730523156632595024 |
[1,36,861,17296,316251,5461512,90858768, 1473109704,23446881315,368136785016,5720645481903, 88188515933856,1350990969850340,20592957740312160, 312629484400483356,4730523156632595024] |