n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 3 |
4 | 14 |
5 | 65 |
6 | 680 |
7 | 8407 |
8 | 131416 |
9 | 2391515 |
10 | 50006040 |
11 | 1178973851 |
12 | 30958827996 |
13 | 896080197025 |
14 | 28346960490560 |
15 | 973097534189967 |
16 | 36028797169965112 |
17 | 1431211525754907905 |
18 | 60719765554419645244 |
19 | 2740193428892401092979 |
20 | 131072000000281600209176 |
[1,1,2,3,14,65,680,8407,131416,2391515,50006040, 1178973851,30958827996,896080197025, 28346960490560,973097534189967,36028797169965112, 1431211525754907905,60719765554419645244, 2740193428892401092979,131072000000281600209176] |