n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 12 |
4 | 44 |
5 | 172 |
6 | 700 |
7 | 2940 |
8 | 12652 |
9 | 55500 |
10 | 247260 |
11 | 1115740 |
12 | 5088908 |
13 | 23423020 |
14 | 108659324 |
15 | 507520316 |
16 | 2384733868 |
17 | 11264884876 |
18 | 53464215580 |
19 | 254822253852 |
20 | 1219182031820 |
21 | 5853309920748 |
22 | 28190437248700 |
23 | 136160853462524 |
24 | 659401832797676 |
25 | 3201141695492172 |
26 | 15575294057678428 |
[1,2,4,12,44,172,700,2940,12652,55500,247260, 1115740,5088908,23423020,108659324,507520316, 2384733868,11264884876,53464215580,254822253852, 1219182031820,5853309920748,28190437248700, 136160853462524,659401832797676,3201141695492172, 15575294057678428] |