n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 3 |
5 | 15 |
6 | 45 |
7 | 105 |
8 | 315 |
9 | 1323 |
10 | 5355 |
11 | 18315 |
12 | 63855 |
13 | 272415 |
14 | 1264263 |
15 | 5409495 |
16 | 22302735 |
17 | 101343375 |
18 | 507711375 |
19 | 2495918223 |
20 | 11798364735 |
21 | 58074029055 |
22 | 309240315615 |
23 | 1670570920095 |
24 | 8792390355903 |
25 | 46886941456575 |
26 | 264381946998975 |
27 | 1533013006902975 |
28 | 8785301059346175 |
29 | 50439885753378303 |
[0,0,0,3,15,45,105,315,1323,5355,18315,63855, 272415,1264263,5409495,22302735,101343375, 507711375,2495918223,11798364735,58074029055, 309240315615,1670570920095,8792390355903, 46886941456575,264381946998975,1533013006902975, 8785301059346175,50439885753378303] |