n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 20 |
5 | 800 |
6 | 14260 |
7 | 189280 |
8 | 2181060 |
9 | 23241120 |
10 | 235737620 |
11 | 2308206560 |
12 | 21979728100 |
13 | 204477713440 |
14 | 1864504348980 |
15 | 16707856095840 |
16 | 147469451067140 |
17 | 1284607771225760 |
18 | 11063319237792340 |
19 | 94343562846289120 |
20 | 797685042851814180 |
21 | 6694943490279586080 |
[0,0,0,0,20,800,14260,189280,2181060,23241120, 235737620,2308206560,21979728100,204477713440, 1864504348980,16707856095840,147469451067140, 1284607771225760,11063319237792340, 94343562846289120,797685042851814180, 6694943490279586080] |