n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 5 |
3 | 15 |
4 | 49 |
5 | 177 |
6 | 715 |
7 | 3255 |
8 | 16689 |
9 | 95777 |
10 | 609875 |
11 | 4270695 |
12 | 32624329 |
13 | 269995377 |
14 | 2406363835 |
15 | 22979029335 |
16 | 234062319969 |
17 | 2533147494977 |
18 | 29027730898595 |
19 | 351112918079175 |
20 | 4470508510495609 |
21 | 59766296291090577 |
[1,2,5,15,49,177,715,3255,16689,95777,609875, 4270695,32624329,269995377,2406363835,22979029335, 234062319969,2533147494977,29027730898595, 351112918079175,4470508510495609, 59766296291090577] |