n | a(n) |
---|---|
2 | 1 |
3 | 6 |
4 | 27 |
5 | 110 |
6 | 429 |
7 | 1638 |
8 | 6188 |
9 | 23256 |
10 | 87210 |
11 | 326876 |
12 | 1225785 |
13 | 4601610 |
14 | 17298645 |
15 | 65132550 |
16 | 245642760 |
17 | 927983760 |
18 | 3511574910 |
19 | 13309856820 |
20 | 50528160150 |
21 | 192113383644 |
22 | 731508653106 |
23 | 2789279908316 |
24 | 10649977831752 |
25 | 40715807302800 |
26 | 155851062397940 |
27 | 597261490737912 |
[1,6,27,110,429,1638,6188,23256,87210,326876, 1225785,4601610,17298645,65132550,245642760, 927983760,3511574910,13309856820,50528160150, 192113383644,731508653106,2789279908316, 10649977831752,40715807302800,155851062397940, 597261490737912] |