n | a(n) |
---|---|
1 | 0 |
2 | 2 |
3 | 7 |
4 | 22 |
5 | 75 |
6 | 254 |
7 | 859 |
8 | 2906 |
9 | 9831 |
10 | 33258 |
11 | 112511 |
12 | 380622 |
13 | 1287635 |
14 | 4356038 |
15 | 14736371 |
16 | 49852786 |
17 | 168650767 |
18 | 570541458 |
19 | 1930127927 |
20 | 6529576006 |
21 | 22089397403 |
22 | 74727896142 |
23 | 252802661835 |
24 | 855225279050 |
25 | 2893206395127 |
26 | 9787647126266 |
[0,2,7,22,75,254,859,2906,9831,33258,112511, 380622,1287635,4356038,14736371,49852786, 168650767,570541458,1930127927,6529576006, 22089397403,74727896142,252802661835,855225279050, 2893206395127,9787647126266] |