n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 20 |
4 | 63 |
5 | 213 |
6 | 719 |
7 | 2505 |
8 | 8864 |
9 | 31948 |
10 | 116725 |
11 | 432074 |
12 | 1616022 |
13 | 6100775 |
14 | 23214144 |
15 | 88949045 |
16 | 342899474 |
17 | 1329020016 |
18 | 5175758820 |
19 | 20243197030 |
20 | 79480515302 |
21 | 313155710230 |
22 | 1237771800135 |
23 | 4906616164195 |
24 | 19502048947616 |
25 | 77703941363599 |
26 | 310305199056779 |
[1,2,6,20,63,213,719,2505,8864,31948,116725, 432074,1616022,6100775,23214144,88949045, 342899474,1329020016,5175758820,20243197030, 79480515302,313155710230,1237771800135, 4906616164195,19502048947616,77703941363599, 310305199056779] |