n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 2 |
6 | 20 |
7 | 198 |
8 | 2048 |
9 | 22468 |
10 | 264538 |
11 | 3340962 |
12 | 45173518 |
13 | 652209564 |
14 | 10024669626 |
15 | 163546399460 |
16 | 2823941647390 |
17 | 51468705947590 |
18 | 987671243816650 |
19 | 19909066390361346 |
20 | 420650676776338140 |
21 | 9297308938203169622 |
22 | 214562999510569012168 |
[0,0,0,0,2,20,198,2048,22468,264538,3340962, 45173518,652209564,10024669626,163546399460, 2823941647390,51468705947590,987671243816650, 19909066390361346,420650676776338140, 9297308938203169622,214562999510569012168] |