n | a(n) |
---|---|
2 | 1 |
3 | 1 |
4 | 4 |
5 | 6 |
6 | 18 |
7 | 42 |
8 | 118 |
9 | 314 |
10 | 895 |
11 | 2521 |
12 | 7307 |
13 | 21238 |
14 | 62566 |
15 | 185310 |
16 | 553288 |
17 | 1660490 |
18 | 5011299 |
19 | 15190665 |
20 | 46244031 |
21 | 141296042 |
22 | 433204573 |
23 | 1332261200 |
24 | 4108833222 |
25 | 12704949506 |
26 | 39379343929 |
27 | 122327632914 |
28 | 380778749899 |
29 | 1187544117426 |
[1,1,4,6,18,42,118,314,895,2521,7307,21238,62566, 185310,553288,1660490,5011299,15190665,46244031, 141296042,433204573,1332261200,4108833222, 12704949506,39379343929,122327632914,380778749899, 1187544117426] |