n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 1 |
5 | 1 |
6 | 1 |
7 | 3 |
8 | 7 |
9 | 15 |
10 | 33 |
11 | 101 |
12 | 381 |
13 | 1709 |
14 | 8457 |
15 | 46629 |
16 | 303839 |
17 | 2310935 |
18 | 20572541 |
19 | 212895819 |
20 | 2545278493 |
21 | 35199007061 |
[1,1,1,1,1,1,3,7,15,33,101,381,1709,8457,46629, 303839,2310935,20572541,212895819,2545278493, 35199007061] |