n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 4 |
4 | 16 |
5 | 76 |
6 | 381 |
7 | 2010 |
8 | 10955 |
9 | 61265 |
10 | 349472 |
11 | 2025632 |
12 | 11896039 |
13 | 70632739 |
14 | 423300099 |
15 | 2557174039 |
16 | 15555534859 |
17 | 95202925651 |
18 | 585799778042 |
19 | 3621806301246 |
20 | 22488577587970 |
21 | 140176525844646 |
22 | 876813040040057 |
23 | 5501997007343589 |
24 | 34625517090342459 |
25 | 218489435424317825 |
26 | 1382072993052136903 |
[1,1,4,16,76,381,2010,10955,61265,349472,2025632, 11896039,70632739,423300099,2557174039, 15555534859,95202925651,585799778042, 3621806301246,22488577587970,140176525844646, 876813040040057,5501997007343589, 34625517090342459,218489435424317825, 1382072993052136903] |