n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 15 |
5 | 50 |
6 | 178 |
7 | 663 |
8 | 2552 |
9 | 10071 |
10 | 40528 |
11 | 165682 |
12 | 686151 |
13 | 2872576 |
14 | 12137278 |
15 | 51690255 |
16 | 221657999 |
17 | 956265050 |
18 | 4147533262 |
19 | 18074429421 |
20 | 79102157060 |
21 | 347519074010 |
22 | 1532070899412 |
23 | 6775687911920 |
24 | 30052744139440 |
25 | 133649573395725 |
26 | 595816470717728 |
[1,1,2,5,15,50,178,663,2552,10071,40528,165682, 686151,2872576,12137278,51690255,221657999, 956265050,4147533262,18074429421,79102157060, 347519074010,1532070899412,6775687911920, 30052744139440,133649573395725,595816470717728] |