n | a(n) |
---|---|
0 | 1 |
1 | 5 |
2 | 20 |
3 | 60 |
4 | 260 |
5 | 1148 |
6 | 4908 |
7 | 19800 |
8 | 79804 |
9 | 324408 |
10 | 1301600 |
11 | 5225644 |
12 | 20917704 |
13 | 83744756 |
14 | 335197576 |
15 | 1340967308 |
[1,5,20,60,260,1148,4908,19800,79804,324408, 1301600,5225644,20917704,83744756,335197576, 1340967308] |