n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 1 |
4 | 5 |
5 | 5 |
6 | 21 |
7 | 21 |
8 | 84 |
9 | 84 |
10 | 330 |
11 | 330 |
12 | 1287 |
13 | 1287 |
14 | 5005 |
15 | 5005 |
16 | 19448 |
17 | 19448 |
18 | 75582 |
19 | 75582 |
20 | 293930 |
21 | 293930 |
22 | 1144066 |
23 | 1144066 |
24 | 4457400 |
25 | 4457400 |
26 | 17383860 |
27 | 17383860 |
28 | 67863915 |
29 | 67863915 |
30 | 265182525 |
[0,0,1,1,5,5,21,21,84,84,330,330,1287,1287,5005, 5005,19448,19448,75582,75582,293930,293930, 1144066,1144066,4457400,4457400,17383860,17383860, 67863915,67863915,265182525] |