n | a(n) |
---|---|
3 | 1 |
4 | 9 |
5 | 55 |
6 | 286 |
7 | 1365 |
8 | 6188 |
9 | 27132 |
10 | 116280 |
11 | 490314 |
12 | 2042975 |
13 | 8436285 |
14 | 34597290 |
15 | 141120525 |
16 | 573166440 |
17 | 2319959400 |
18 | 9364199760 |
19 | 37711260990 |
20 | 151584480450 |
21 | 608359048206 |
22 | 2438362177020 |
23 | 9762479679106 |
24 | 39049918716424 |
25 | 156077261327400 |
26 | 623404249591760 |
[1,9,55,286,1365,6188,27132,116280,490314,2042975, 8436285,34597290,141120525,573166440,2319959400, 9364199760,37711260990,151584480450,608359048206, 2438362177020,9762479679106,39049918716424, 156077261327400,623404249591760] |