n | a(n) |
---|---|
7 | 4 |
8 | 28 |
9 | 176 |
10 | 950 |
11 | 4908 |
12 | 24402 |
13 | 119240 |
14 | 575348 |
15 | 2757460 |
16 | 13157752 |
17 | 62638788 |
18 | 297832008 |
19 | 1415550920 |
20 | 6728600060 |
21 | 31998023632 |
22 | 152271569872 |
23 | 725231959452 |
24 | 3457304575812 |
25 | 16497751608120 |
26 | 78804354881238 |
27 | 376806016649964 |
28 | 1803539487096138 |
29 | 8641075826669256 |
30 | 41441524062045660 |
[4,28,176,950,4908,24402,119240,575348,2757460, 13157752,62638788,297832008,1415550920,6728600060, 31998023632,152271569872,725231959452, 3457304575812,16497751608120,78804354881238, 376806016649964,1803539487096138,8641075826669256, 41441524062045660] |