n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 6 |
4 | 30 |
5 | 140 |
6 | 615 |
7 | 2562 |
8 | 10220 |
9 | 39384 |
10 | 147645 |
11 | 541310 |
12 | 1948650 |
13 | 6908772 |
14 | 24180611 |
15 | 83702010 |
16 | 286978200 |
17 | 975725744 |
18 | 3293074233 |
19 | 11041484022 |
20 | 36804946550 |
21 | 122037454140 |
22 | 402723598431 |
23 | 1323234680306 |
24 | 4330586226180 |
[0,0,1,6,30,140,615,2562,10220,39384,147645, 541310,1948650,6908772,24180611,83702010, 286978200,975725744,3293074233,11041484022, 36804946550,122037454140,402723598431, 1323234680306,4330586226180] |