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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 39916800 |
| 2 | 1456812592995513600 |
| 3 | 166369951631853645510591187200 |
| 4 | 31707078596527364069316526441204831526400 |
| 5 | 8089435115221815003427192379950659547969112311680000 |
| 6 | 2492107900477900258313589438717998843635090670139189341868499200 |
[1,39916800,1456812592995513600, 166369951631853645510591187200, 31707078596527364069316526441204831526400, 80894351152218150034271923799506595479691123116800\ 00, 24921079004779002583135894387179988436350906701391\ 89341868499200] |