n | a(n) |
---|---|
1 | 4 |
2 | 16 |
3 | 64 |
4 | 240 |
5 | 988 |
6 | 3964 |
7 | 15844 |
8 | 63808 |
9 | 256096 |
10 | 1029152 |
11 | 4133548 |
12 | 16607836 |
13 | 66714260 |
14 | 268019952 |
15 | 1076703872 |
16 | 4325480208 |
17 | 17376731196 |
18 | 69807805884 |
19 | 280439281284 |
20 | 1126611556192 |
21 | 4525945532832 |
22 | 18182121542848 |
23 | 73043190744972 |
[4,16,64,240,988,3964,15844,63808,256096,1029152, 4133548,16607836,66714260,268019952,1076703872, 4325480208,17376731196,69807805884,280439281284, 1126611556192,4525945532832,18182121542848, 73043190744972] |