n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 8 |
6 | 18 |
7 | 40 |
8 | 95 |
9 | 227 |
10 | 557 |
11 | 1382 |
12 | 3485 |
13 | 8865 |
14 | 22790 |
15 | 59022 |
16 | 153972 |
17 | 404066 |
18 | 1066236 |
19 | 2826885 |
20 | 7527411 |
21 | 20121154 |
[1,1,2,4,8,18,40,95,227,557,1382,3485,8865,22790, 59022,153972,404066,1066236,2826885,7527411, 20121154] |