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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 4 |
| 4 | 11 |
| 5 | 6 |
| 6 | 72 |
| 7 | 8 |
| 8 | 499 |
| 9 | 850 |
| 10 | 4988 |
| 11 | 12 |
| 12 | 142232 |
| 13 | 14 |
| 14 | 949392 |
| 15 | 7385394 |
| 16 | 26739587 |
| 17 | 18 |
| 18 | 1462302432 |
| 19 | 20 |
| 20 | 21233776156 |
| 21 | 253684768502 |
| 22 | 151243121780 |
| 23 | 24 |
| 24 | 104533367794192 |
| 25 | 25973364296906 |
| 26 | 102776106948752 |
| 27 | 26798029481115778 |
| 28 | 95394359150584904 |
| 29 | 30 |
[1,3,4,11,6,72,8,499,850,4988,12,142232,14,949392, 7385394,26739587,18,1462302432,20,21233776156, 253684768502,151243121780,24,104533367794192, 25973364296906,102776106948752,26798029481115778, 95394359150584904,30] |