n | a(n) |
---|---|
2 | 0 |
3 | 4 |
4 | 16 |
5 | 60 |
6 | 224 |
7 | 840 |
8 | 3168 |
9 | 12012 |
10 | 45760 |
11 | 175032 |
12 | 671840 |
13 | 2586584 |
14 | 9984576 |
15 | 38630800 |
16 | 149768640 |
17 | 581690700 |
18 | 2262890880 |
19 | 8815845720 |
20 | 34389986400 |
21 | 134312002440 |
22 | 525129633600 |
23 | 2055166429680 |
24 | 8050465600320 |
25 | 31561484455800 |
[0,4,16,60,224,840,3168,12012,45760,175032,671840, 2586584,9984576,38630800,149768640,581690700, 2262890880,8815845720,34389986400,134312002440, 525129633600,2055166429680,8050465600320, 31561484455800] |