n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 1 |
5 | 0 |
6 | 5 |
7 | 8 |
8 | 21 |
9 | 42 |
10 | 89 |
11 | 180 |
12 | 361 |
13 | 720 |
14 | 1438 |
15 | 2867 |
16 | 5696 |
17 | 11282 |
18 | 22392 |
19 | 44340 |
20 | 87887 |
21 | 174045 |
22 | 344719 |
23 | 682767 |
24 | 1352375 |
25 | 2678305 |
26 | 5305631 |
27 | 10510870 |
28 | 20824910 |
29 | 41264654 |
30 | 81776998 |
31 | 162083352 |
32 | 321295873 |
[0,0,0,1,0,5,8,21,42,89,180,361,720,1438,2867, 5696,11282,22392,44340,87887,174045,344719,682767, 1352375,2678305,5305631,10510870,20824910, 41264654,81776998,162083352,321295873] |