n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 2 |
4 | 12 |
5 | 50 |
6 | 220 |
7 | 882 |
8 | 3612 |
9 | 14450 |
10 | 58140 |
11 | 232562 |
12 | 931612 |
13 | 3726450 |
14 | 14911260 |
15 | 59645042 |
16 | 238602012 |
17 | 954408050 |
18 | 3817719580 |
19 | 15270878322 |
20 | 61083862812 |
21 | 244335451250 |
22 | 977343203100 |
23 | 3909372812402 |
[0,0,0,2,12,50,220,882,3612,14450,58140,232562, 931612,3726450,14911260,59645042,238602012, 954408050,3817719580,15270878322,61083862812, 244335451250,977343203100,3909372812402] |