n | a(n) |
---|---|
2 | 1 |
3 | 1 |
4 | 2 |
5 | 5 |
6 | 14 |
7 | 50 |
8 | 233 |
9 | 1248 |
10 | 7593 |
11 | 49536 |
12 | 339483 |
13 | 2404472 |
14 | 17468202 |
15 | 129459090 |
16 | 975647292 |
17 | 7458907217 |
18 | 57744122366 |
19 | 452028275567 |
20 | 3573870490382 |
[1,1,2,5,14,50,233,1248,7593,49536,339483,2404472, 17468202,129459090,975647292,7458907217, 57744122366,452028275567,3573870490382] |