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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 232 |
| 8 | 66178 |
| 9 | 24243520 |
| 10 | 11234051976 |
| 11 | 6549149852112 |
| 12 | 4762109992158288 |
| 13 | 4274712091685443584 |
| 14 | 4686484162304929219950 |
| 15 | 6209619146419137708859600 |
| 16 | 9845751579221258486943505348 |
| 17 | 18509102695712474753650903363840 |
| 18 | 40904306737052771732376660591663712 |
[1,232,66178,24243520,11234051976,6549149852112, 4762109992158288,4274712091685443584, 4686484162304929219950,6209619146419137708859600, 9845751579221258486943505348, 18509102695712474753650903363840, 40904306737052771732376660591663712] |