n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 15 |
5 | 45 |
6 | 136 |
7 | 430 |
8 | 1415 |
9 | 4845 |
10 | 17235 |
11 | 63509 |
12 | 242854 |
13 | 959904 |
14 | 3926209 |
15 | 16564083 |
16 | 72097127 |
17 | 322898943 |
18 | 1487602607 |
19 | 7034420691 |
20 | 34122991199 |
21 | 169499127425 |
22 | 861596397518 |
23 | 4475340840980 |
24 | 23738200183570 |
25 | 128427236055296 |
26 | 708248486616539 |
27 | 3977551340260517 |
[1,1,2,6,15,45,136,430,1415,4845,17235,63509, 242854,959904,3926209,16564083,72097127,322898943, 1487602607,7034420691,34122991199,169499127425, 861596397518,4475340840980,23738200183570, 128427236055296,708248486616539,3977551340260517] |