n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 1 |
4 | 7 |
5 | 31 |
6 | 91 |
7 | 211 |
8 | 1681 |
9 | 12097 |
10 | 57961 |
11 | 209881 |
12 | 1874071 |
13 | 17842111 |
14 | 117303187 |
15 | 575683291 |
16 | 26124309121 |
17 | 412992394081 |
18 | 3670397429041 |
19 | 23161791013777 |
20 | 729420726627271 |
21 | 13374596287229311 |
22 | 143560108604864491 |
[1,1,1,1,7,31,91,211,1681,12097,57961,209881, 1874071,17842111,117303187,575683291,26124309121, 412992394081,3670397429041,23161791013777, 729420726627271,13374596287229311, 143560108604864491] |