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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 3 |
| 5 | 15 |
| 6 | 15 |
| 7 | 1605 |
| 8 | 1605 |
| 9 | 19425 |
| 10 | 2397347205 |
| 11 | 153535525935 |
| 12 | 29503289812425 |
| 13 | 29503289812425 |
| 14 | 32467505340816975 |
| 15 | 143924005810811655 |
| 16 | 143924005810811655 |
[1,1,3,3,15,15,1605,1605,19425,2397347205, 153535525935,29503289812425,29503289812425, 32467505340816975,143924005810811655, 143924005810811655] |