n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 1 |
4 | 1 |
5 | 1 |
6 | 1 |
7 | 1 |
8 | 1 |
9 | 1 |
10 | 9 |
11 | 45 |
12 | 165 |
13 | 495 |
14 | 1287 |
15 | 3003 |
16 | 6435 |
17 | 12870 |
18 | 207350 |
19 | 1782638 |
20 | 10852478 |
21 | 52422578 |
22 | 213586658 |
23 | 762311978 |
24 | 2445069626 |
25 | 7177825511 |
26 | 167072419775 |
27 | 2041472747275 |
28 | 17401832788275 |
29 | 116094500641665 |
30 | 645070724513865 |
31 | 3103383925397925 |
[1,1,1,1,1,1,1,1,1,1,9,45,165,495,1287,3003,6435, 12870,207350,1782638,10852478,52422578,213586658, 762311978,2445069626,7177825511,167072419775, 2041472747275,17401832788275,116094500641665, 645070724513865,3103383925397925] |