n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 14 |
3 | 54 |
4 | 200 |
5 | 776 |
6 | 2940 |
7 | 11466 |
8 | 43980 |
9 | 172170 |
10 | 665544 |
11 | 2612764 |
12 | 10154144 |
13 | 39949000 |
14 | 155864280 |
15 | 614260062 |
16 | 2403739140 |
17 | 9486263092 |
18 | 37209147800 |
19 | 147012850512 |
20 | 577741491404 |
21 | 2284848892872 |
22 | 8993216244896 |
23 | 35595538140656 |
24 | 140288753584200 |
25 | 555662416386840 |
[1,4,14,54,200,776,2940,11466,43980,172170,665544, 2612764,10154144,39949000,155864280,614260062, 2403739140,9486263092,37209147800,147012850512, 577741491404,2284848892872,8993216244896, 35595538140656,140288753584200,555662416386840] |