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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 4 |
| 5 | 26 |
| 6 | 192 |
| 7 | 1551 |
| 8 | 13416 |
| 9 | 122770 |
| 10 | 1180496 |
| 11 | 11883079 |
| 12 | 124992672 |
| 13 | 1372811900 |
| 14 | 15741602608 |
| 15 | 188470662702 |
| 16 | 2356327731016 |
| 17 | 30760057620142 |
| 18 | 419124712458444 |
| 19 | 5956905826561685 |
| 20 | 88230307480324360 |
| 21 | 1360309585677285312 |
[1,4,26,192,1551,13416,122770,1180496,11883079, 124992672,1372811900,15741602608,188470662702, 2356327731016,30760057620142,419124712458444, 5956905826561685,88230307480324360, 1360309585677285312] |