n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 5 |
3 | 25 |
4 | 129 |
5 | 681 |
6 | 3653 |
7 | 19825 |
8 | 108545 |
9 | 598417 |
10 | 3317445 |
11 | 18474633 |
12 | 103274625 |
13 | 579168825 |
14 | 3256957317 |
15 | 18359266785 |
16 | 103706427393 |
17 | 586889743905 |
18 | 3326741166725 |
19 | 18885056428537 |
20 | 107347191941249 |
21 | 610916200215241 |
[0,1,5,25,129,681,3653,19825,108545,598417, 3317445,18474633,103274625,579168825,3256957317, 18359266785,103706427393,586889743905, 3326741166725,18885056428537,107347191941249, 610916200215241] |