n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 15 |
5 | 52 |
6 | 203 |
7 | 876 |
8 | 4111 |
9 | 20648 |
10 | 109299 |
11 | 601492 |
12 | 3403127 |
13 | 19628064 |
14 | 114700315 |
15 | 676207628 |
16 | 4010090463 |
17 | 23874362200 |
18 | 142508723651 |
19 | 852124263684 |
20 | 5101098232519 |
21 | 30560194493456 |
22 | 183176170057707 |
[1,1,2,5,15,52,203,876,4111,20648,109299,601492, 3403127,19628064,114700315,676207628,4010090463, 23874362200,142508723651,852124263684, 5101098232519,30560194493456,183176170057707] |