n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 6 |
4 | 54 |
5 | 440 |
6 | 3975 |
7 | 38934 |
8 | 415324 |
9 | 4805856 |
10 | 60073245 |
11 | 807651350 |
12 | 11630179506 |
13 | 178681848696 |
14 | 2918470195459 |
15 | 50511984152070 |
16 | 923647710209400 |
17 | 17795612550034304 |
18 | 360361154138194809 |
19 | 7652375096699313126 |
20 | 170052779926651402990 |
21 | 3947014523560698353400 |
[0,0,1,6,54,440,3975,38934,415324,4805856, 60073245,807651350,11630179506,178681848696, 2918470195459,50511984152070,923647710209400, 17795612550034304,360361154138194809, 7652375096699313126,170052779926651402990, 3947014523560698353400] |