n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 3 |
4 | 7 |
5 | 23 |
6 | 83 |
7 | 405 |
8 | 2113 |
9 | 12657 |
10 | 82297 |
11 | 596483 |
12 | 4698655 |
13 | 40071743 |
14 | 367854835 |
15 | 3622508685 |
16 | 38027715185 |
17 | 424060091065 |
18 | 5006620130753 |
19 | 62395131973755 |
20 | 818456924866815 |
21 | 11271715349614463 |
[1,1,1,3,7,23,83,405,2113,12657,82297,596483, 4698655,40071743,367854835,3622508685,38027715185, 424060091065,5006620130753,62395131973755, 818456924866815,11271715349614463] |