n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 2 |
3 | 4 |
4 | 16 |
5 | 31 |
6 | 122 |
7 | 973 |
8 | 3890 |
9 | 30317 |
10 | 486144 |
11 | 3845485 |
12 | 61098761 |
13 | 1952652536 |
14 | 30753790733 |
15 | 973261651722 |
16 | 61980407029298 |
17 | 1943138871957133 |
18 | 122570367648067555 |
[1,2,2,4,16,31,122,973,3890,30317,486144,3845485, 61098761,1952652536,30753790733,973261651722, 61980407029298,1943138871957133, 122570367648067555] |