n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 9 |
4 | 72 |
5 | 570 |
6 | 4635 |
7 | 39186 |
8 | 345828 |
9 | 3188268 |
10 | 30684150 |
11 | 307870365 |
12 | 3215425554 |
13 | 34899450768 |
14 | 393015753039 |
15 | 4585024011015 |
16 | 55332235452960 |
17 | 689799432341928 |
18 | 8871905851132041 |
19 | 117581467377389310 |
20 | 1603990651356920730 |
[0,0,1,9,72,570,4635,39186,345828,3188268, 30684150,307870365,3215425554,34899450768, 393015753039,4585024011015,55332235452960, 689799432341928,8871905851132041, 117581467377389310,1603990651356920730] |