n | a(n) |
---|---|
2 | 5 |
3 | 15 |
4 | 50 |
5 | 150 |
6 | 455 |
7 | 1365 |
8 | 4100 |
9 | 12300 |
10 | 36905 |
11 | 110715 |
12 | 332150 |
13 | 996450 |
14 | 2989355 |
15 | 8968065 |
16 | 26904200 |
17 | 80712600 |
18 | 242137805 |
19 | 726413415 |
20 | 2179240250 |
21 | 6537720750 |
22 | 19613162255 |
23 | 58839486765 |
24 | 176518460300 |
25 | 529555380900 |
26 | 1588666142705 |
27 | 4765998428115 |
28 | 14297995284350 |
[5,15,50,150,455,1365,4100,12300,36905,110715, 332150,996450,2989355,8968065,26904200,80712600, 242137805,726413415,2179240250,6537720750, 19613162255,58839486765,176518460300,529555380900, 1588666142705,4765998428115,14297995284350] |