n | a(n) |
---|---|
1 | 4 |
2 | 10 |
3 | 40 |
4 | 86 |
5 | 336 |
6 | 704 |
7 | 2704 |
8 | 5660 |
9 | 21504 |
10 | 45176 |
11 | 170464 |
12 | 359400 |
13 | 1350272 |
14 | 2854496 |
15 | 10694912 |
16 | 22650672 |
17 | 84716224 |
18 | 179637056 |
19 | 671110848 |
20 | 1424180800 |
21 | 5316817088 |
22 | 11288673952 |
23 | 42124029504 |
24 | 89466980000 |
25 | 333750473152 |
26 | 708999096096 |
27 | 2644373950784 |
28 | 5618300601952 |
[4,10,40,86,336,704,2704,5660,21504,45176,170464, 359400,1350272,2854496,10694912,22650672,84716224, 179637056,671110848,1424180800,5316817088, 11288673952,42124029504,89466980000,333750473152, 708999096096,2644373950784,5618300601952] |