n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 2 |
4 | 6 |
5 | 25 |
6 | 136 |
7 | 879 |
8 | 6554 |
9 | 55412 |
10 | 523897 |
11 | 5477110 |
12 | 62737807 |
13 | 781370863 |
14 | 10512989797 |
15 | 151960488890 |
16 | 2348480282846 |
17 | 38643175563195 |
18 | 674499064375772 |
19 | 12447573642571061 |
20 | 242161887228200640 |
21 | 4953311329667740359 |
[1,0,1,2,6,25,136,879,6554,55412,523897,5477110, 62737807,781370863,10512989797,151960488890, 2348480282846,38643175563195,674499064375772, 12447573642571061,242161887228200640, 4953311329667740359] |