n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 1 |
5 | 2 |
6 | 5 |
7 | 15 |
8 | 53 |
9 | 213 |
10 | 961 |
11 | 4808 |
12 | 26405 |
13 | 157965 |
14 | 1022573 |
15 | 7122441 |
16 | 53118601 |
17 | 422362118 |
18 | 3566967917 |
19 | 31887812715 |
20 | 300848966213 |
21 | 2987359924149 |
22 | 31143724848889 |
23 | 340113005563268 |
24 | 3882897830626949 |
25 | 46254432194746377 |
26 | 573938743829923349 |
27 | 7406289665830324689 |
[1,1,1,1,2,5,15,53,213,961,4808,26405,157965, 1022573,7122441,53118601,422362118,3566967917, 31887812715,300848966213,2987359924149, 31143724848889,340113005563268,3882897830626949, 46254432194746377,573938743829923349, 7406289665830324689] |