n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 6 |
3 | 42 |
4 | 252 |
5 | 1728 |
6 | 10584 |
7 | 71280 |
8 | 435456 |
9 | 2939328 |
10 | 17962560 |
11 | 119532672 |
12 | 739031040 |
13 | 4867527168 |
14 | 30051689472 |
15 | 198147658752 |
16 | 1221537687552 |
17 | 7984437608448 |
18 | 49643697954816 |
19 | 321998350270464 |
20 | 1997815999463424 |
21 | 12977575759282176 |
22 | 80455233450737664 |
23 | 519208351807832064 |
[1,1,6,42,252,1728,10584,71280,435456,2939328, 17962560,119532672,739031040,4867527168, 30051689472,198147658752,1221537687552, 7984437608448,49643697954816,321998350270464, 1997815999463424,12977575759282176, 80455233450737664,519208351807832064] |