n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 5 |
3 | 28 |
4 | 165 |
5 | 1001 |
6 | 6188 |
7 | 38760 |
8 | 245157 |
9 | 1562275 |
10 | 10015005 |
11 | 64512240 |
12 | 417225900 |
13 | 2707475148 |
14 | 17620076360 |
15 | 114955808528 |
16 | 751616304549 |
17 | 4923689695575 |
18 | 32308782859535 |
19 | 212327989773900 |
20 | 1397281501935165 |
21 | 9206478467454345 |
22 | 60727722660586800 |
23 | 400978991944396320 |
[0,1,5,28,165,1001,6188,38760,245157,1562275, 10015005,64512240,417225900,2707475148, 17620076360,114955808528,751616304549, 4923689695575,32308782859535,212327989773900, 1397281501935165,9206478467454345, 60727722660586800,400978991944396320] |