n | a(n) |
---|---|
3 | 1 |
4 | 1 |
5 | 5 |
6 | 17 |
7 | 57 |
8 | 189 |
9 | 613 |
10 | 1949 |
11 | 6097 |
12 | 18825 |
13 | 57525 |
14 | 174353 |
15 | 525049 |
16 | 1573077 |
17 | 4693909 |
18 | 13960805 |
19 | 41415089 |
20 | 122603341 |
21 | 362343053 |
22 | 1069436317 |
23 | 3152995209 |
24 | 9287942097 |
25 | 27341397469 |
26 | 80443393889 |
27 | 236581555233 |
28 | 695561538977 |
[1,1,5,17,57,189,613,1949,6097,18825,57525,174353, 525049,1573077,4693909,13960805,41415089, 122603341,362343053,1069436317,3152995209, 9287942097,27341397469,80443393889,236581555233, 695561538977] |