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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 3 |
| 4 | 18 |
| 5 | 3010 |
| 6 | 166725 |
| 7 | 8371713 |
| 8 | 307008163 |
| 9 | 8869151172 |
| 10 | 244109996040 |
| 11 | 6625340217595 |
| 12 | 174712060895757 |
| 13 | 4452494561526960 |
| 14 | 108958868923534266 |
| 15 | 2551477805087525055 |
| 16 | 57187304932168982070 |
| 17 | 1233918981730653994884 |
[1,3,18,3010,166725,8371713,307008163,8869151172, 244109996040,6625340217595,174712060895757, 4452494561526960,108958868923534266, 2551477805087525055,57187304932168982070, 1233918981730653994884] |