n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 17 |
4 | 50 |
5 | 147 |
6 | 435 |
7 | 1290 |
8 | 3834 |
9 | 11411 |
10 | 34001 |
11 | 101400 |
12 | 302615 |
13 | 903632 |
14 | 2699598 |
15 | 8068257 |
16 | 24121674 |
17 | 72137547 |
18 | 215786649 |
19 | 645629160 |
20 | 1932081885 |
21 | 5782851966 |
22 | 17311097568 |
23 | 51828203475 |
24 | 155188936431 |
25 | 464732722872 |
[1,2,6,17,50,147,435,1290,3834,11411,34001,101400, 302615,903632,2699598,8068257,24121674,72137547, 215786649,645629160,1932081885,5782851966, 17311097568,51828203475,155188936431,464732722872] |