n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 24 |
5 | 121 |
6 | 726 |
7 | 5082 |
8 | 40656 |
9 | 365905 |
10 | 3659050 |
11 | 40249550 |
12 | 482994600 |
13 | 6278929801 |
14 | 87905017214 |
15 | 1318575258210 |
16 | 21097204131360 |
17 | 358652470233121 |
18 | 6455744464196178 |
19 | 122659144819727382 |
20 | 2453182896394547640 |
21 | 51516840824285500441 |
22 | 1133370498134281009702 |
[0,1,2,6,24,121,726,5082,40656,365905,3659050, 40249550,482994600,6278929801,87905017214, 1318575258210,21097204131360,358652470233121, 6455744464196178,122659144819727382, 2453182896394547640,51516840824285500441, 1133370498134281009702] |