n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 20 |
5 | 125 |
6 | 1070 |
7 | 11465 |
8 | 146600 |
9 | 2173625 |
10 | 36633050 |
11 | 691362125 |
12 | 14440672700 |
13 | 330674815925 |
14 | 8236528396550 |
15 | 221694575073425 |
16 | 6411977928702800 |
17 | 198310761891213425 |
18 | 6530970632654064050 |
[0,1,2,5,20,125,1070,11465,146600,2173625, 36633050,691362125,14440672700,330674815925, 8236528396550,221694575073425,6411977928702800, 198310761891213425,6530970632654064050] |