n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 6 |
4 | 40 |
5 | 285 |
6 | 2126 |
7 | 16380 |
8 | 129456 |
9 | 1043460 |
10 | 8544965 |
11 | 70893054 |
12 | 594610536 |
13 | 5033644070 |
14 | 42952562100 |
15 | 369061673400 |
16 | 3190379997272 |
17 | 27727712947836 |
18 | 242135589539124 |
19 | 2123541227823800 |
20 | 18695484623015200 |
21 | 165169213716082765 |
[1,1,6,40,285,2126,16380,129456,1043460,8544965, 70893054,594610536,5033644070,42952562100, 369061673400,3190379997272,27727712947836, 242135589539124,2123541227823800, 18695484623015200,165169213716082765] |