n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 2 |
3 | 6 |
4 | 44 |
5 | 360 |
6 | 4206 |
7 | 59584 |
8 | 1021432 |
9 | 20329344 |
10 | 461596090 |
11 | 11756157952 |
12 | 331835099364 |
13 | 10278341179392 |
14 | 346555737301606 |
15 | 12633922368061440 |
16 | 495139124241620080 |
17 | 20758413862397509632 |
18 | 926980786260912379122 |
19 | 43925328338613823078400 |
20 | 2201264843743619567644700 |
[0,0,2,6,44,360,4206,59584,1021432,20329344, 461596090,11756157952,331835099364,10278341179392, 346555737301606,12633922368061440, 495139124241620080,20758413862397509632, 926980786260912379122,43925328338613823078400, 2201264843743619567644700] |