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| n | a(n) |
|---|---|
| 1 | 28 |
| 2 | 2178540 |
| 3 | 45532800 |
| 4 | 142990848 |
| 5 | 14182439040 |
| 6 | 43861478400 |
| 7 | 518666803200 |
| 8 | 704575228896 |
| 9 | 13661860101120 |
| 10 | 181742883469056 |
| 11 | 740344994887680 |
| 12 | 20158185857531904 |
| 13 | 275502900594021408 |
| 14 | 71065075104190073088 |
| 15 | 87934476737668055040 |
| 16 | 154345556085770649600 |
| 17 | 1161492388333469337600 |
[28,2178540,45532800,142990848,14182439040, 43861478400,518666803200,704575228896, 13661860101120,181742883469056,740344994887680, 20158185857531904,275502900594021408, 71065075104190073088,87934476737668055040, 154345556085770649600,1161492388333469337600] |