n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 0 |
7 | 0 |
8 | 0 |
9 | 1 |
10 | 0 |
11 | 0 |
12 | 9 |
13 | 33 |
14 | 104 |
15 | 280 |
16 | 948 |
17 | 3014 |
18 | 9494 |
19 | 30302 |
20 | 98897 |
21 | 323372 |
22 | 1080168 |
23 | 3666666 |
24 | 12604812 |
25 | 43734613 |
26 | 153788715 |
[0,0,0,0,0,0,0,0,1,0,0,9,33,104,280,948,3014,9494, 30302,98897,323372,1080168,3666666,12604812, 43734613,153788715] |