n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 12 |
4 | 30 |
5 | 504 |
6 | 1320 |
7 | 43680 |
8 | 116280 |
9 | 6375600 |
10 | 17100720 |
11 | 1402410240 |
12 | 3776965920 |
13 | 8835488640 |
14 | 1022755734000 |
15 | 2478652606080 |
16 | 380634949094400 |
17 | 945378254620800 |
18 | 186127248627129600 |
19 | 470489622136934400 |
20 | 115590003914312928000 |
[1,2,12,30,504,1320,43680,116280,6375600,17100720, 1402410240,3776965920,8835488640,1022755734000, 2478652606080,380634949094400,945378254620800, 186127248627129600,470489622136934400, 115590003914312928000] |