n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 16 |
4 | 67 |
5 | 276 |
6 | 1212 |
7 | 5391 |
8 | 24003 |
9 | 107719 |
10 | 486728 |
11 | 2208735 |
12 | 10059868 |
13 | 45970367 |
14 | 210657177 |
15 | 967636566 |
16 | 4454109123 |
17 | 20540731356 |
18 | 94882599285 |
19 | 438931979661 |
20 | 2033217678792 |
21 | 9429562243530 |
22 | 43779688919145 |
23 | 203463271733010 |
24 | 946445226206940 |
25 | 4406251540834026 |
[1,1,3,16,67,276,1212,5391,24003,107719,486728, 2208735,10059868,45970367,210657177,967636566, 4454109123,20540731356,94882599285,438931979661, 2033217678792,9429562243530,43779688919145, 203463271733010,946445226206940,4406251540834026] |