n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 5 |
3 | 15 |
4 | 50 |
5 | 180 |
6 | 672 |
7 | 2604 |
8 | 10323 |
9 | 41831 |
10 | 172429 |
11 | 720543 |
12 | 3049052 |
13 | 13030183 |
14 | 56185637 |
15 | 244129491 |
16 | 1067890597 |
17 | 4699223135 |
18 | 20788315074 |
19 | 92400789578 |
20 | 412460510507 |
21 | 1848288462615 |
22 | 8311490226015 |
23 | 37495508818308 |
24 | 169649803369283 |
25 | 769655804205711 |
26 | 3500411708041304 |
27 | 15956530625752614 |
[1,2,5,15,50,180,672,2604,10323,41831,172429, 720543,3049052,13030183,56185637,244129491, 1067890597,4699223135,20788315074,92400789578, 412460510507,1848288462615,8311490226015, 37495508818308,169649803369283,769655804205711, 3500411708041304,15956530625752614] |