n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 3 |
4 | 7 |
5 | 16 |
6 | 41 |
7 | 108 |
8 | 301 |
9 | 881 |
10 | 2684 |
11 | 8455 |
12 | 27444 |
13 | 91248 |
14 | 309593 |
15 | 1068584 |
16 | 3742171 |
17 | 13269281 |
18 | 47561455 |
19 | 172092274 |
20 | 627887239 |
21 | 2307902495 |
22 | 8539497952 |
23 | 31786480760 |
24 | 118960956585 |
25 | 447413177185 |
26 | 1690336204778 |
27 | 6412656031161 |
[1,1,3,7,16,41,108,301,881,2684,8455,27444,91248, 309593,1068584,3742171,13269281,47561455, 172092274,627887239,2307902495,8539497952, 31786480760,118960956585,447413177185, 1690336204778,6412656031161] |