n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 2 |
3 | 6 |
4 | 84 |
5 | 860 |
6 | 14430 |
7 | 257082 |
8 | 5678456 |
9 | 140241096 |
10 | 3952791450 |
11 | 123539438990 |
12 | 4266378769092 |
13 | 160943793753756 |
14 | 6592371152535350 |
15 | 291260465060881890 |
16 | 13809548247503299440 |
17 | 699362685890810753552 |
18 | 37679514498664685654706 |
[1,0,2,6,84,860,14430,257082,5678456,140241096, 3952791450,123539438990,4266378769092, 160943793753756,6592371152535350, 291260465060881890,13809548247503299440, 699362685890810753552,37679514498664685654706] |