n | a(n) |
---|---|
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 1 |
7 | 1 |
8 | 1 |
9 | 4 |
10 | 5 |
11 | 14 |
12 | 28 |
13 | 86 |
14 | 211 |
15 | 648 |
16 | 1878 |
17 | 5931 |
18 | 18326 |
19 | 58746 |
20 | 187620 |
21 | 608065 |
22 | 1975191 |
23 | 6461809 |
24 | 21212414 |
[0,0,0,0,1,1,1,4,5,14,28,86,211,648,1878,5931, 18326,58746,187620,608065,1975191,6461809, 21212414] |