n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 6 |
5 | 20 |
6 | 72 |
7 | 271 |
8 | 1055 |
9 | 4212 |
10 | 17152 |
11 | 70966 |
12 | 297482 |
13 | 1260715 |
14 | 5392627 |
15 | 23251149 |
16 | 100947165 |
17 | 440939300 |
18 | 1936388032 |
19 | 8544353718 |
20 | 37863744762 |
21 | 168438633954 |
22 | 751927422662 |
23 | 3367361700052 |
24 | 15123922285632 |
25 | 68107641527359 |
[1,1,2,6,20,72,271,1055,4212,17152,70966,297482, 1260715,5392627,23251149,100947165,440939300, 1936388032,8544353718,37863744762,168438633954, 751927422662,3367361700052,15123922285632, 68107641527359] |