n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 1 |
5 | 3 |
6 | 17 |
7 | 104 |
8 | 740 |
9 | 6006 |
10 | 54717 |
11 | 553254 |
12 | 6147264 |
13 | 74450194 |
14 | 976124761 |
15 | 13774204959 |
16 | 208143541601 |
17 | 3353423725801 |
18 | 57380805974819 |
19 | 1039230152655058 |
20 | 19860842917407766 |
21 | 399423618672311730 |
[1,0,0,0,1,3,17,104,740,6006,54717,553254,6147264, 74450194,976124761,13774204959,208143541601, 3353423725801,57380805974819,1039230152655058, 19860842917407766,399423618672311730] |