n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 5 |
3 | 15 |
4 | 45 |
5 | 125 |
6 | 342 |
7 | 921 |
8 | 2461 |
9 | 6535 |
10 | 17282 |
11 | 45567 |
12 | 119898 |
13 | 315020 |
14 | 826830 |
15 | 2168583 |
16 | 5684731 |
17 | 14896459 |
18 | 39024899 |
19 | 102216045 |
20 | 267693813 |
21 | 700997144 |
22 | 1835543565 |
23 | 4806092673 |
24 | 12583591525 |
25 | 32946281848 |
26 | 86258240735 |
27 | 225834015840 |
[1,1,5,15,45,125,342,921,2461,6535,17282,45567, 119898,315020,826830,2168583,5684731,14896459, 39024899,102216045,267693813,700997144,1835543565, 4806092673,12583591525,32946281848,86258240735, 225834015840] |