n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 20 |
4 | 70 |
5 | 252 |
6 | 896 |
7 | 2976 |
8 | 8955 |
9 | 24310 |
10 | 60038 |
11 | 136500 |
12 | 289016 |
13 | 575680 |
14 | 1087920 |
15 | 1964384 |
16 | 3408789 |
17 | 5712426 |
18 | 9282070 |
19 | 14674100 |
20 | 22635690 |
21 | 34153988 |
22 | 50514256 |
23 | 73368000 |
24 | 104812175 |
25 | 147480606 |
26 | 204648822 |
27 | 280353556 |
28 | 379528220 |
29 | 508155720 |
30 | 673440032 |
31 | 883998016 |
[1,2,6,20,70,252,896,2976,8955,24310,60038,136500, 289016,575680,1087920,1964384,3408789,5712426, 9282070,14674100,22635690,34153988,50514256, 73368000,104812175,147480606,204648822,280353556, 379528220,508155720,673440032,883998016] |