n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 1 |
7 | 1 |
8 | 1 |
9 | 2 |
10 | 5 |
11 | 15 |
12 | 64 |
13 | 342 |
14 | 2344 |
15 | 19090 |
16 | 179562 |
17 | 1878277 |
18 | 21365403 |
19 | 258965451 |
20 | 3294561195 |
21 | 43472906719 |
22 | 589744428065 |
23 | 8171396893523 |
24 | 115094557122380 |
25 | 1642269376265063 |
26 | 23679803216530017 |
27 | 344396036645439675 |
28 | 5045351124912000756 |
[0,0,0,0,0,1,1,1,2,5,15,64,342,2344,19090,179562, 1878277,21365403,258965451,3294561195,43472906719, 589744428065,8171396893523,115094557122380, 1642269376265063,23679803216530017, 344396036645439675,5045351124912000756] |