n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 20 |
5 | 65 |
6 | 241 |
7 | 889 |
8 | 3472 |
9 | 13622 |
10 | 55340 |
11 | 225557 |
12 | 940725 |
13 | 3937330 |
14 | 16738031 |
15 | 71404967 |
16 | 307999065 |
17 | 1332931401 |
18 | 5815439839 |
19 | 25450058722 |
20 | 112060278048 |
21 | 494798567807 |
22 | 2195172975521 |
23 | 9763509301815 |
24 | 43589884062136 |
25 | 195052842541424 |
26 | 875498008541850 |
27 | 3937713690439906 |
28 | 17755851945737789 |
[1,1,2,6,20,65,241,889,3472,13622,55340,225557, 940725,3937330,16738031,71404967,307999065, 1332931401,5815439839,25450058722,112060278048, 494798567807,2195172975521,9763509301815, 43589884062136,195052842541424,875498008541850, 3937713690439906,17755851945737789] |