n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 5 |
3 | 15 |
4 | 75 |
5 | 275 |
6 | 1375 |
7 | 5601 |
8 | 28005 |
9 | 121089 |
10 | 605445 |
11 | 2715677 |
12 | 13578385 |
13 | 62402157 |
14 | 312010785 |
15 | 1458538087 |
16 | 7292690435 |
17 | 34518363331 |
18 | 172591816655 |
19 | 824661140195 |
20 | 4123305700975 |
21 | 19846014090155 |
22 | 99230070450775 |
23 | 480374578408091 |
24 | 2401872892040455 |
25 | 11681652878375315 |
26 | 58408264391876575 |
27 | 285150381706792519 |
[1,1,5,15,75,275,1375,5601,28005,121089,605445, 2715677,13578385,62402157,312010785,1458538087, 7292690435,34518363331,172591816655,824661140195, 4123305700975,19846014090155,99230070450775, 480374578408091,2401872892040455, 11681652878375315,58408264391876575, 285150381706792519] |