n | a(n) |
---|---|
1 | 6 |
2 | 15 |
3 | 50 |
4 | 210 |
5 | 882 |
6 | 4220 |
7 | 20640 |
8 | 107100 |
9 | 563730 |
10 | 3036411 |
11 | 16514100 |
12 | 90778485 |
13 | 502474350 |
14 | 2799199380 |
15 | 15673672238 |
16 | 88162569180 |
17 | 497847963690 |
18 | 2821127257950 |
19 | 16035812864940 |
20 | 91404065292036 |
[6,15,50,210,882,4220,20640,107100,563730,3036411, 16514100,90778485,502474350,2799199380, 15673672238,88162569180,497847963690, 2821127257950,16035812864940,91404065292036] |