n | a(n) |
---|---|
4 | 4 |
5 | 23 |
6 | 107 |
7 | 464 |
8 | 1950 |
9 | 8063 |
10 | 33033 |
11 | 134576 |
12 | 546312 |
13 | 2212550 |
14 | 8946454 |
15 | 36134656 |
16 | 145831270 |
17 | 588199815 |
18 | 2371435125 |
19 | 9557736480 |
20 | 38511326040 |
21 | 155143873170 |
22 | 624899673690 |
23 | 2516678580000 |
24 | 10134353299980 |
25 | 40805797511622 |
[4,23,107,464,1950,8063,33033,134576,546312, 2212550,8946454,36134656,145831270,588199815, 2371435125,9557736480,38511326040,155143873170, 624899673690,2516678580000,10134353299980, 40805797511622] |