n | a(n) |
---|---|
1 | 1 |
2 | 6 |
3 | 25 |
4 | 111 |
5 | 488 |
6 | 2149 |
7 | 9461 |
8 | 41654 |
9 | 183389 |
10 | 807403 |
11 | 3554736 |
12 | 15650361 |
13 | 68903513 |
14 | 303360038 |
15 | 1335596817 |
16 | 5880203831 |
17 | 25888648920 |
18 | 113979406525 |
19 | 501814720109 |
20 | 2209329044566 |
21 | 9726966211957 |
22 | 42824708216851 |
23 | 188543436246752 |
24 | 830096195208753 |
25 | 3654646945111665 |
[1,6,25,111,488,2149,9461,41654,183389,807403, 3554736,15650361,68903513,303360038,1335596817, 5880203831,25888648920,113979406525,501814720109, 2209329044566,9726966211957,42824708216851, 188543436246752,830096195208753,3654646945111665] |