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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 26 |
| 6 | 820 |
| 7 | 35150 |
| 8 | 1944530 |
| 9 | 133948836 |
| 10 | 11234051976 |
| 11 | 1127512146540 |
| 12 | 133475706272700 |
| 13 | 18406586045919060 |
| 14 | 2925154024273348296 |
| 15 | 530686776655470875076 |
| 16 | 109004840145995702773410 |
| 17 | 25164525076896596670014400 |
| 18 | 6486836210471246515195539840 |
| 19 | 1856264107759263993451053077856 |
[1,26,820,35150,1944530,133948836,11234051976, 1127512146540,133475706272700,18406586045919060, 2925154024273348296,530686776655470875076, 109004840145995702773410, 25164525076896596670014400, 6486836210471246515195539840, 1856264107759263993451053077856] |