n | a(n) |
---|---|
3 | 0 |
4 | 0 |
5 | 4 |
6 | 6 |
7 | 8 |
8 | 30 |
9 | 59 |
10 | 110 |
11 | 307 |
12 | 702 |
13 | 1467 |
14 | 3540 |
15 | 8881 |
16 | 21238 |
17 | 51411 |
18 | 131267 |
19 | 336955 |
20 | 858389 |
21 | 2231616 |
22 | 5873842 |
23 | 15436593 |
24 | 40783461 |
25 | 108380373 |
26 | 288172019 |
27 | 767283935 |
28 | 2047446019 |
29 | 5468198458 |
30 | 14615722327 |
31 | 39109795012 |
[0,0,4,6,8,30,59,110,307,702,1467,3540,8881,21238, 51411,131267,336955,858389,2231616,5873842, 15436593,40783461,108380373,288172019,767283935, 2047446019,5468198458,14615722327,39109795012] |