n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 3 |
5 | 6 |
6 | 26 |
7 | 84 |
8 | 324 |
9 | 1170 |
10 | 4412 |
11 | 16313 |
12 | 61138 |
13 | 227383 |
14 | 849667 |
15 | 3168419 |
16 | 11831104 |
17 | 44144206 |
18 | 164792736 |
19 | 615027929 |
20 | 2295714687 |
[1,1,1,3,6,26,84,324,1170,4412,16313,61138,227383, 849667,3168419,11831104,44144206,164792736, 615027929,2295714687] |