n | a(n) |
---|---|
1 | 1 |
2 | 6 |
3 | 36 |
4 | 220 |
5 | 1365 |
6 | 8568 |
7 | 54264 |
8 | 346104 |
9 | 2220075 |
10 | 14307150 |
11 | 92561040 |
12 | 600805296 |
13 | 3910797436 |
14 | 25518731280 |
15 | 166871334960 |
16 | 1093260079344 |
17 | 7174519270695 |
18 | 47153358767970 |
19 | 310325523515700 |
20 | 2044802197953900 |
21 | 13488561475572645 |
22 | 89067326568860640 |
23 | 588671286046028640 |
[1,6,36,220,1365,8568,54264,346104,2220075, 14307150,92561040,600805296,3910797436, 25518731280,166871334960,1093260079344, 7174519270695,47153358767970,310325523515700, 2044802197953900,13488561475572645, 89067326568860640,588671286046028640] |