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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 21 |
| 5 | 293 |
| 6 | 7025 |
| 7 | 257973 |
| 8 | 13401901 |
| 9 | 932658707 |
| 10 | 83605059701 |
| 11 | 9373165053231 |
| 12 | 1284252646176937 |
| 13 | 211069744296165851 |
| 14 | 40975307787528699929 |
| 15 | 9274936424952726229667 |
| 16 | 2420958940356091360967253 |
| 17 | 721771327240539119577124369 |
[1,1,3,21,293,7025,257973,13401901,932658707, 83605059701,9373165053231,1284252646176937, 211069744296165851,40975307787528699929, 9274936424952726229667,2420958940356091360967253, 721771327240539119577124369] |