n | a(n) |
---|---|
0 | 1 |
1 | 10 |
2 | 70 |
3 | 420 |
4 | 2310 |
5 | 12012 |
6 | 60060 |
7 | 291720 |
8 | 1385670 |
9 | 6466460 |
10 | 29745716 |
11 | 135207800 |
12 | 608435100 |
13 | 2714556600 |
14 | 12021607800 |
15 | 52895074320 |
16 | 231415950150 |
17 | 1007340018300 |
18 | 4365140079300 |
19 | 18839025605400 |
20 | 81007810103220 |
21 | 347176329013800 |
22 | 1483389769422600 |
[1,10,70,420,2310,12012,60060,291720,1385670, 6466460,29745716,135207800,608435100,2714556600, 12021607800,52895074320,231415950150, 1007340018300,4365140079300,18839025605400, 81007810103220,347176329013800,1483389769422600] |