n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 3 |
4 | 11 |
5 | 45 |
6 | 197 |
7 | 901 |
8 | 4259 |
9 | 20643 |
10 | 102035 |
11 | 512365 |
12 | 2606421 |
13 | 13403715 |
14 | 69568071 |
15 | 363946211 |
16 | 1917148173 |
17 | 10160087333 |
18 | 54132552109 |
19 | 289790960735 |
20 | 1557980372127 |
21 | 8408281616305 |
22 | 45536927325809 |
23 | 247397689058521 |
[1,1,3,11,45,197,901,4259,20643,102035,512365, 2606421,13403715,69568071,363946211,1917148173, 10160087333,54132552109,289790960735, 1557980372127,8408281616305,45536927325809, 247397689058521] |