n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 12 |
4 | 36 |
5 | 180 |
6 | 1260 |
7 | 7560 |
8 | 25200 |
9 | 277200 |
10 | 1663200 |
11 | 21621600 |
12 | 64864800 |
13 | 735134400 |
14 | 6983776800 |
15 | 146659312800 |
16 | 1613252440800 |
17 | 37104806138400 |
18 | 445257673660800 |
19 | 4452576736608000 |
20 | 38588998383936000 |
21 | 1080491954750208000 |
[1,4,12,36,180,1260,7560,25200,277200,1663200, 21621600,64864800,735134400,6983776800, 146659312800,1613252440800,37104806138400, 445257673660800,4452576736608000, 38588998383936000,1080491954750208000] |