n | a(n) |
---|---|
0 | 0 |
1 | 4 |
2 | 16 |
3 | 60 |
4 | 224 |
5 | 836 |
6 | 3120 |
7 | 11644 |
8 | 43456 |
9 | 162180 |
10 | 605264 |
11 | 2258876 |
12 | 8430240 |
13 | 31462084 |
14 | 117418096 |
15 | 438210300 |
16 | 1635423104 |
17 | 6103482116 |
18 | 22778505360 |
19 | 85010539324 |
20 | 317263651936 |
21 | 1184044068420 |
22 | 4418912621744 |
23 | 16491606418556 |
24 | 61547513052480 |
25 | 229698445791364 |
[0,4,16,60,224,836,3120,11644,43456,162180,605264, 2258876,8430240,31462084,117418096,438210300, 1635423104,6103482116,22778505360,85010539324, 317263651936,1184044068420,4418912621744, 16491606418556,61547513052480,229698445791364] |