n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 3 |
4 | 7 |
5 | 23 |
6 | 55 |
7 | 247 |
8 | 1015 |
9 | 5623 |
10 | 24055 |
11 | 208375 |
12 | 945655 |
13 | 9793015 |
14 | 62877175 |
15 | 487550455 |
16 | 3884936695 |
17 | 58243116535 |
18 | 384392195575 |
19 | 6255075618295 |
20 | 53220543000055 |
21 | 616806151581175 |
22 | 6252662237392375 |
23 | 130241496125238775 |
24 | 1122152167228009975 |
25 | 20960365589283433975 |
[0,1,3,7,23,55,247,1015,5623,24055,208375,945655, 9793015,62877175,487550455,3884936695,58243116535, 384392195575,6255075618295,53220543000055, 616806151581175,6252662237392375, 130241496125238775,1122152167228009975, 20960365589283433975] |