n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 2 |
4 | 15 |
5 | 140 |
6 | 1575 |
7 | 20790 |
8 | 315315 |
9 | 5405400 |
10 | 103378275 |
11 | 2182430250 |
12 | 50414138775 |
13 | 1264936572900 |
14 | 34258698849375 |
15 | 996137551158750 |
16 | 30951416768146875 |
17 | 1023460181133390000 |
18 | 35885072600989486875 |
19 | 1329858572860198631250 |
20 | 51938365373373313209375 |
[1,0,1,2,15,140,1575,20790,315315,5405400, 103378275,2182430250,50414138775,1264936572900, 34258698849375,996137551158750,30951416768146875, 1023460181133390000,35885072600989486875, 1329858572860198631250,51938365373373313209375] |