n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 6 |
4 | 36 |
5 | 150 |
6 | 1260 |
7 | 16926 |
8 | 197316 |
9 | 2286150 |
10 | 32821020 |
11 | 548528046 |
12 | 9515702196 |
13 | 174531124950 |
14 | 3521913283980 |
15 | 76969474578366 |
16 | 1777400236160676 |
17 | 43405229295464550 |
18 | 1126972561394470140 |
19 | 30949983774936839886 |
20 | 893095888222540548756 |
21 | 27035433957000465352950 |
[1,0,0,6,36,150,1260,16926,197316,2286150, 32821020,548528046,9515702196,174531124950, 3521913283980,76969474578366,1777400236160676, 43405229295464550,1126972561394470140, 30949983774936839886,893095888222540548756, 27035433957000465352950] |