n | a(n) |
---|---|
3 | 0 |
4 | 0 |
5 | 4 |
6 | 6 |
7 | 4 |
8 | 24 |
9 | 46 |
10 | 100 |
11 | 224 |
12 | 626 |
13 | 1332 |
14 | 3558 |
15 | 9054 |
16 | 23406 |
17 | 56916 |
18 | 153209 |
19 | 395282 |
20 | 1031598 |
21 | 2680090 |
22 | 7143821 |
23 | 18739498 |
24 | 49780598 |
25 | 132071728 |
26 | 352703766 |
27 | 940103198 |
28 | 2521317666 |
29 | 6760089774 |
30 | 18187588014 |
[0,0,4,6,4,24,46,100,224,626,1332,3558,9054,23406, 56916,153209,395282,1031598,2680090,7143821, 18739498,49780598,132071728,352703766,940103198, 2521317666,6760089774,18187588014] |