n | a(n) |
---|---|
1 | 0 |
2 | 6 |
3 | 30 |
4 | 144 |
5 | 672 |
6 | 3108 |
7 | 14328 |
8 | 65976 |
9 | 303672 |
10 | 1397520 |
11 | 6431136 |
12 | 29594352 |
13 | 136184256 |
14 | 626677152 |
15 | 2883768672 |
16 | 13270180608 |
17 | 61065117312 |
18 | 281002082880 |
19 | 1293081432192 |
20 | 5950345861248 |
21 | 27381582408576 |
22 | 126001256419584 |
[0,6,30,144,672,3108,14328,65976,303672,1397520, 6431136,29594352,136184256,626677152,2883768672, 13270180608,61065117312,281002082880, 1293081432192,5950345861248,27381582408576, 126001256419584] |