n | a(n) |
---|---|
1 | 2 |
2 | 0 |
3 | 4 |
4 | 16 |
5 | 60 |
6 | 228 |
7 | 1024 |
8 | 4288 |
9 | 18172 |
10 | 76838 |
11 | 326264 |
12 | 1390048 |
13 | 5947760 |
14 | 25515274 |
15 | 109801760 |
16 | 473895774 |
17 | 2050771696 |
18 | 8896415264 |
19 | 38680996104 |
20 | 168532976250 |
21 | 735715851956 |
22 | 3217440736916 |
23 | 14093823129980 |
24 | 61831989407076 |
[2,0,4,16,60,228,1024,4288,18172,76838,326264, 1390048,5947760,25515274,109801760,473895774, 2050771696,8896415264,38680996104,168532976250, 735715851956,3217440736916,14093823129980, 61831989407076] |