n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 5 |
3 | 18 |
4 | 87 |
5 | 290 |
6 | 1553 |
7 | 5015 |
8 | 25436 |
9 | 94500 |
10 | 431464 |
11 | 1519749 |
12 | 8024004 |
13 | 26746757 |
14 | 125190249 |
15 | 498138920 |
16 | 2221127601 |
17 | 8020960187 |
18 | 38836436844 |
19 | 138444409552 |
20 | 655009491676 |
21 | 2512996318026 |
22 | 10775473291178 |
23 | 40824090856703 |
[1,1,5,18,87,290,1553,5015,25436,94500,431464, 1519749,8024004,26746757,125190249,498138920, 2221127601,8020960187,38836436844,138444409552, 655009491676,2512996318026,10775473291178, 40824090856703] |