n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 5 |
3 | 27 |
4 | 145 |
5 | 779 |
6 | 4185 |
7 | 22483 |
8 | 120785 |
9 | 648891 |
10 | 3486025 |
11 | 18727907 |
12 | 100611585 |
13 | 540513739 |
14 | 2903791865 |
15 | 15599986803 |
16 | 83807517745 |
17 | 450237562331 |
18 | 2418802847145 |
19 | 12994489360387 |
20 | 69810052496225 |
21 | 375039241201899 |
22 | 2014816311001945 |
23 | 10824160037413523 |
[0,1,5,27,145,779,4185,22483,120785,648891, 3486025,18727907,100611585,540513739,2903791865, 15599986803,83807517745,450237562331, 2418802847145,12994489360387,69810052496225, 375039241201899,2014816311001945, 10824160037413523] |