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| n | a(n) |
|---|---|
| 2 | 8 |
| 3 | 1857 |
| 4 | 232740 |
| 5 | 26296475 |
| 6 | 2128426860 |
| 7 | 110964458710 |
| 8 | 3533207162352 |
| 9 | 73077185537370 |
| 10 | 1067559034014900 |
| 11 | 11805270721428855 |
| 12 | 104131103837358468 |
| 13 | 762072014041423813 |
| 14 | 4768129728862470880 |
| 15 | 26106675760931007900 |
| 16 | 127411116947126838720 |
| 17 | 562536757736562399012 |
[8,1857,232740,26296475,2128426860,110964458710, 3533207162352,73077185537370,1067559034014900, 11805270721428855,104131103837358468, 762072014041423813,4768129728862470880, 26106675760931007900,127411116947126838720, 562536757736562399012] |