n | a(n) |
---|---|
4 | 1 |
5 | 2 |
6 | 10 |
7 | 40 |
8 | 185 |
9 | 828 |
10 | 3805 |
11 | 17411 |
12 | 80177 |
13 | 369675 |
14 | 1710173 |
15 | 7931011 |
16 | 36884730 |
17 | 171987194 |
18 | 804027444 |
19 | 3767994408 |
20 | 17699839325 |
21 | 83328339997 |
22 | 393123808821 |
23 | 1858351499207 |
24 | 8801160980038 |
25 | 41756069328689 |
26 | 198437460900302 |
27 | 944521149228740 |
28 | 4502419787519360 |
[1,2,10,40,185,828,3805,17411,80177,369675, 1710173,7931011,36884730,171987194,804027444, 3767994408,17699839325,83328339997,393123808821, 1858351499207,8801160980038,41756069328689, 198437460900302,944521149228740,4502419787519360] |