n | a(n) |
---|---|
0 | 0 |
1 | 4 |
2 | 16 |
3 | 80 |
4 | 384 |
5 | 1856 |
6 | 8960 |
7 | 43264 |
8 | 208896 |
9 | 1008640 |
10 | 4870144 |
11 | 23515136 |
12 | 113541120 |
13 | 548225024 |
14 | 2647064576 |
15 | 12781158400 |
16 | 61712891904 |
17 | 297976201216 |
18 | 1438756372480 |
19 | 6946930294784 |
20 | 33542746669056 |
21 | 161958707855360 |
[0,4,16,80,384,1856,8960,43264,208896,1008640, 4870144,23515136,113541120,548225024,2647064576, 12781158400,61712891904,297976201216, 1438756372480,6946930294784,33542746669056, 161958707855360] |