n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 3 |
4 | 12 |
5 | 40 |
6 | 120 |
7 | 336 |
8 | 7168 |
9 | 58752 |
10 | 345600 |
11 | 1682560 |
12 | 15983616 |
13 | 142192128 |
14 | 2318697472 |
15 | 25614382080 |
16 | 282753361920 |
17 | 2645093410816 |
18 | 48869743454208 |
19 | 674729909839872 |
20 | 12153962014842880 |
21 | 167314499427532800 |
22 | 1986101341059956736 |
23 | 20335611320801886208 |
[0,0,1,3,12,40,120,336,7168,58752,345600,1682560, 15983616,142192128,2318697472,25614382080, 282753361920,2645093410816,48869743454208, 674729909839872,12153962014842880, 167314499427532800,1986101341059956736, 20335611320801886208] |