n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 1 |
4 | 1 |
5 | 1 |
6 | 1 |
7 | 2 |
8 | 5 |
9 | 15 |
10 | 52 |
11 | 203 |
12 | 878 |
13 | 4172 |
14 | 21767 |
15 | 125536 |
16 | 809254 |
17 | 5890115 |
18 | 48560551 |
19 | 450859572 |
20 | 4657423009 |
21 | 52802518648 |
22 | 649162712358 |
23 | 8574743501046 |
24 | 120876064485660 |
25 | 1809924607067234 |
26 | 28694297293078915 |
27 | 480719498205658859 |
28 | 8502406681853097237 |
[1,1,1,1,1,1,1,2,5,15,52,203,878,4172,21767, 125536,809254,5890115,48560551,450859572, 4657423009,52802518648,649162712358,8574743501046, 120876064485660,1809924607067234, 28694297293078915,480719498205658859, 8502406681853097237] |