n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 3 |
4 | 13 |
5 | 51 |
6 | 278 |
7 | 1500 |
8 | 7939 |
9 | 41835 |
10 | 216304 |
11 | 1098036 |
12 | 5469347 |
13 | 26720527 |
14 | 128062654 |
15 | 602383825 |
16 | 2782565907 |
17 | 12630464094 |
18 | 56374423419 |
19 | 247582918975 |
20 | 1070576473665 |
21 | 4560847659120 |
[1,2,3,13,51,278,1500,7939,41835,216304,1098036, 5469347,26720527,128062654,602383825,2782565907, 12630464094,56374423419,247582918975, 1070576473665,4560847659120] |