n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 15 |
5 | 52 |
6 | 203 |
7 | 877 |
8 | 4140 |
9 | 21147 |
10 | 111835 |
11 | 607726 |
12 | 3372147 |
13 | 19006265 |
14 | 108345829 |
15 | 622553137 |
16 | 3596571484 |
17 | 20854506433 |
18 | 121247283115 |
19 | 706276123051 |
20 | 4119684344466 |
21 | 24052768332415 |
22 | 140525287140277 |
23 | 821384370939660 |
24 | 4802655803213444 |
25 | 28087804863005024 |
[1,1,2,5,15,52,203,877,4140,21147,111835,607726, 3372147,19006265,108345829,622553137,3596571484, 20854506433,121247283115,706276123051, 4119684344466,24052768332415,140525287140277, 821384370939660,4802655803213444, 28087804863005024] |