n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 20 |
5 | 80 |
6 | 362 |
7 | 1820 |
8 | 10084 |
9 | 60522 |
10 | 391864 |
11 | 2714514 |
12 | 20001700 |
13 | 156107224 |
14 | 1284705246 |
15 | 11112088358 |
16 | 100698613720 |
17 | 953478331288 |
18 | 9410963022318 |
19 | 96614921664444 |
20 | 1029705968813656 |
21 | 11373102766644372 |
22 | 129972789566984682 |
23 | 1534638410054873892 |
24 | 18696544357738885720 |
[1,1,2,6,20,80,362,1820,10084,60522,391864, 2714514,20001700,156107224,1284705246,11112088358, 100698613720,953478331288,9410963022318, 96614921664444,1029705968813656,11373102766644372, 129972789566984682,1534638410054873892, 18696544357738885720] |