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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 16 |
| 4 | 125 |
| 5 | 1320 |
| 6 | 17671 |
| 7 | 286336 |
| 8 | 5436153 |
| 9 | 118144000 |
| 10 | 2889312875 |
| 11 | 78480441216 |
| 12 | 2343333279157 |
| 13 | 76274737767424 |
| 14 | 2687742759243375 |
| 15 | 101931212748928000 |
| 16 | 4139544785141163761 |
| 17 | 179235455194948829184 |
| 18 | 8242391462093927638867 |
| 19 | 401202300756829929472000 |
[1,1,3,16,125,1320,17671,286336,5436153,118144000, 2889312875,78480441216,2343333279157, 76274737767424,2687742759243375, 101931212748928000,4139544785141163761, 179235455194948829184,8242391462093927638867, 401202300756829929472000] |