n | a(n) |
---|---|
0 | 1 |
1 | 5 |
2 | 20 |
3 | 64 |
4 | 260 |
5 | 1092 |
6 | 4288 |
7 | 17288 |
8 | 68896 |
9 | 277084 |
10 | 1114676 |
11 | 4460992 |
12 | 17809152 |
13 | 71255876 |
14 | 285243920 |
15 | 1140843800 |
[1,5,20,64,260,1092,4288,17288,68896,277084, 1114676,4460992,17809152,71255876,285243920, 1140843800] |