n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 3 |
4 | 9 |
5 | 45 |
6 | 225 |
7 | 1575 |
8 | 11130 |
9 | 100170 |
10 | 897750 |
11 | 9875250 |
12 | 108523800 |
13 | 1410809400 |
14 | 18332414100 |
15 | 274986211500 |
16 | 4127136413400 |
17 | 70161319027800 |
18 | 1192076391706200 |
19 | 22649451442417800 |
20 | 430247983427262000 |
21 | 9035207651972502000 |
[1,1,1,3,9,45,225,1575,11130,100170,897750, 9875250,108523800,1410809400,18332414100, 274986211500,4127136413400,70161319027800, 1192076391706200,22649451442417800, 430247983427262000,9035207651972502000] |