n | a(n) |
---|---|
1 | 1 |
2 | 6 |
3 | 21 |
4 | 71 |
5 | 216 |
6 | 657 |
7 | 1907 |
8 | 5507 |
9 | 15522 |
10 | 43352 |
11 | 119140 |
12 | 323946 |
13 | 869476 |
14 | 2308071 |
15 | 6056581 |
16 | 15724170 |
17 | 40393693 |
18 | 102736274 |
19 | 258790004 |
20 | 645968054 |
21 | 1598460229 |
22 | 3923114261 |
23 | 9554122089 |
24 | 23098084695 |
25 | 55458417125 |
26 | 132293945737 |
27 | 313657570114 |
[1,6,21,71,216,657,1907,5507,15522,43352,119140, 323946,869476,2308071,6056581,15724170,40393693, 102736274,258790004,645968054,1598460229, 3923114261,9554122089,23098084695,55458417125, 132293945737,313657570114] |