n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 3 |
4 | 9 |
5 | 40 |
6 | 225 |
7 | 1491 |
8 | 11578 |
9 | 102852 |
10 | 1026945 |
11 | 11394955 |
12 | 139091106 |
13 | 1852061718 |
14 | 26716291693 |
15 | 415033647315 |
16 | 6908006807640 |
17 | 122645325067576 |
18 | 2313546734841633 |
19 | 46209268921868595 |
20 | 974228913850588750 |
21 | 21620679147700290210 |
22 | 503810188866302511501 |
[0,0,1,3,9,40,225,1491,11578,102852,1026945, 11394955,139091106,1852061718,26716291693, 415033647315,6908006807640,122645325067576, 2313546734841633,46209268921868595, 974228913850588750,21620679147700290210, 503810188866302511501] |