n | a(n) |
---|---|
0 | 1 |
1 | 5 |
2 | 20 |
3 | 60 |
4 | 312 |
5 | 1236 |
6 | 5132 |
7 | 20308 |
8 | 84836 |
9 | 348436 |
10 | 1422668 |
11 | 5780620 |
12 | 23307100 |
13 | 93611056 |
14 | 375155196 |
15 | 1502087240 |
[1,5,20,60,312,1236,5132,20308,84836,348436, 1422668,5780620,23307100,93611056,375155196, 1502087240] |