n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 14 |
3 | 75 |
4 | 429 |
5 | 2548 |
6 | 15504 |
7 | 95931 |
8 | 600875 |
9 | 3798795 |
10 | 24192090 |
11 | 154969620 |
12 | 997490844 |
13 | 6446369400 |
14 | 41802112192 |
15 | 271861216539 |
16 | 1772528290407 |
17 | 11582393855305 |
18 | 75831424919250 |
19 | 497337483739635 |
20 | 3266814940064445 |
[1,3,14,75,429,2548,15504,95931,600875,3798795, 24192090,154969620,997490844,6446369400, 41802112192,271861216539,1772528290407, 11582393855305,75831424919250,497337483739635, 3266814940064445] |