n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 3 |
3 | 12 |
4 | 40 |
5 | 135 |
6 | 441 |
7 | 1428 |
8 | 4572 |
9 | 14535 |
10 | 45925 |
11 | 144408 |
12 | 452244 |
13 | 1411501 |
14 | 4392675 |
15 | 13636080 |
16 | 42237792 |
17 | 130580451 |
18 | 403009209 |
19 | 1241912580 |
20 | 3821849640 |
21 | 11746816389 |
22 | 36064532427 |
23 | 110610649548 |
24 | 338928124500 |
25 | 1037636534025 |
[0,1,3,12,40,135,441,1428,4572,14535,45925,144408, 452244,1411501,4392675,13636080,42237792, 130580451,403009209,1241912580,3821849640, 11746816389,36064532427,110610649548,338928124500, 1037636534025] |