n | a(n) |
---|---|
2 | 0 |
3 | 0 |
4 | 3 |
5 | 28 |
6 | 210 |
7 | 1470 |
8 | 9996 |
9 | 67032 |
10 | 446292 |
11 | 2960100 |
12 | 19594575 |
13 | 129585456 |
14 | 856703848 |
15 | 5663913528 |
16 | 37454912040 |
17 | 247778648880 |
18 | 1639890119016 |
19 | 10858731869160 |
20 | 71939098633185 |
21 | 476841658085100 |
22 | 3162310375905450 |
[0,0,3,28,210,1470,9996,67032,446292,2960100, 19594575,129585456,856703848,5663913528, 37454912040,247778648880,1639890119016, 10858731869160,71939098633185,476841658085100, 3162310375905450] |