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| n | a(n) |
|---|---|
| 3 | 32 |
| 4 | 290 |
| 5 | 2240 |
| 6 | 16322 |
| 7 | 116192 |
| 8 | 819170 |
| 9 | 5751680 |
| 10 | 40314242 |
| 11 | 282357152 |
| 12 | 1976972450 |
| 13 | 13840224320 |
| 14 | 96885821762 |
| 15 | 678213506912 |
| 16 | 4747532812130 |
| 17 | 33232844476160 |
| 18 | 232630255706882 |
| 19 | 1628412823069472 |
| 20 | 11398892860850210 |
| 21 | 79792259324043200 |
| 22 | 558545843162577602 |
[32,290,2240,16322,116192,819170,5751680,40314242, 282357152,1976972450,13840224320,96885821762, 678213506912,4747532812130,33232844476160, 232630255706882,1628412823069472, 11398892860850210,79792259324043200, 558545843162577602] |