n | a(n) |
---|---|
1 | 3 |
2 | 3 |
3 | 1 |
4 | 3 |
5 | 12 |
6 | 37 |
7 | 117 |
8 | 333 |
9 | 975 |
10 | 2712 |
11 | 7689 |
12 | 21414 |
13 | 60228 |
14 | 168597 |
15 | 475024 |
16 | 1338525 |
17 | 3788400 |
18 | 10741575 |
19 | 30556305 |
20 | 87109332 |
21 | 248967446 |
22 | 713025093 |
23 | 2046325125 |
24 | 5883406830 |
25 | 16944975036 |
26 | 48880411272 |
27 | 141212376513 |
[3,3,1,3,12,37,117,333,975,2712,7689,21414,60228, 168597,475024,1338525,3788400,10741575,30556305, 87109332,248967446,713025093,2046325125, 5883406830,16944975036,48880411272,141212376513] |