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| n | a(n) |
|---|---|
| 2 | 7 |
| 3 | 19 |
| 4 | 49 |
| 5 | 1962 |
| 6 | 74100 |
| 7 | 100156 |
| 8 | 50911 |
| 9 | 25039 |
| 10 | 13189 |
| 11 | 111925 |
| 12 | 61425 |
| 13 | 172130400 |
| 14 | 15960298816 |
| 15 | 36469482889 |
| 16 | 21338706825 |
| 17 | 6300137600 |
| 18 | 7570610944 |
| 19 | 224166730176 |
| 20 | 49733337790656 |
| 21 | 30706373873700 |
| 22 | 536003165993469300 |
| 23 | 10639031491061081605728 |
| 24 | 4030033479941966540736 |
[7,19,49,1962,74100,100156,50911,25039,13189, 111925,61425,172130400,15960298816,36469482889, 21338706825,6300137600,7570610944,224166730176, 49733337790656,30706373873700,536003165993469300, 10639031491061081605728,4030033479941966540736] |