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| n | a(n) |
|---|---|
| 9 | 1 |
| 10 | 891 |
| 11 | 285726 |
| 12 | 56443751 |
| 13 | 8427587546 |
| 14 | 1054512110471 |
| 15 | 117393128049604 |
| 16 | 12073679346054093 |
| 17 | 1176363620435386899 |
| 18 | 110485582196129404780 |
| 19 | 10128161389764128024757 |
| 20 | 914455342093060805784960 |
| 21 | 81872118868232022795029323 |
[1,891,285726,56443751,8427587546,1054512110471, 117393128049604,12073679346054093, 1176363620435386899,110485582196129404780, 10128161389764128024757,914455342093060805784960, 81872118868232022795029323] |