n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 5 |
3 | 14 |
4 | 42 |
5 | 143 |
6 | 555 |
7 | 2485 |
8 | 12649 |
9 | 72463 |
10 | 461207 |
11 | 3229622 |
12 | 24671899 |
13 | 204185616 |
14 | 1819837153 |
15 | 17378165240 |
16 | 177012514388 |
17 | 1915724368181 |
18 | 21952583954117 |
19 | 265533531724484 |
20 | 3380877926676504 |
21 | 45199008472762756 |
[1,2,5,14,42,143,555,2485,12649,72463,461207, 3229622,24671899,204185616,1819837153,17378165240, 177012514388,1915724368181,21952583954117, 265533531724484,3380877926676504, 45199008472762756] |