n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 0 |
7 | 0 |
8 | 0 |
9 | 3 |
10 | 6 |
11 | 22 |
12 | 76 |
13 | 246 |
14 | 848 |
15 | 2889 |
16 | 9964 |
17 | 34440 |
18 | 119875 |
19 | 420525 |
20 | 1482802 |
21 | 5254679 |
22 | 18713933 |
23 | 66968081 |
24 | 240735712 |
[0,0,0,0,0,0,0,0,3,6,22,76,246,848,2889,9964, 34440,119875,420525,1482802,5254679,18713933, 66968081,240735712] |