n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 30 |
5 | 1260 |
6 | 1680 |
7 | 19825740 |
8 | 10028280 |
9 | 182416547040 |
10 | 271239404020200 |
11 | 219240769050559711332360 |
12 | 6467876945923041743744426827092900 |
13 | 27867228909478820644943875389480 |
[1,1,2,6,30,1260,1680,19825740,10028280, 182416547040,271239404020200, 219240769050559711332360, 6467876945923041743744426827092900, 27867228909478820644943875389480] |