n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 15 |
5 | 52 |
6 | 203 |
7 | 877 |
8 | 3937 |
9 | 18162 |
10 | 85347 |
11 | 405803 |
12 | 1942918 |
13 | 9339084 |
14 | 45003444 |
15 | 217201380 |
16 | 1049271992 |
17 | 5071767524 |
18 | 24523356660 |
19 | 118602078194 |
20 | 573667951966 |
21 | 2774998925735 |
22 | 13424115897227 |
23 | 64941326312858 |
24 | 314169695256551 |
25 | 1519889795069445 |
26 | 7352969270282127 |
[1,1,2,5,15,52,203,877,3937,18162,85347,405803, 1942918,9339084,45003444,217201380,1049271992, 5071767524,24523356660,118602078194,573667951966, 2774998925735,13424115897227,64941326312858, 314169695256551,1519889795069445,7352969270282127] |