n | a(n) |
---|---|
1 | 2 |
2 | 4 |
3 | 10 |
4 | 28 |
5 | 84 |
6 | 272 |
7 | 946 |
8 | 3486 |
9 | 13560 |
10 | 55432 |
11 | 236852 |
12 | 1054928 |
13 | 4881972 |
14 | 23420436 |
15 | 116204016 |
16 | 595246848 |
17 | 3142169416 |
18 | 17068245184 |
19 | 95267426432 |
20 | 545732236936 |
21 | 3204607199704 |
[2,4,10,28,84,272,946,3486,13560,55432,236852, 1054928,4881972,23420436,116204016,595246848, 3142169416,17068245184,95267426432,545732236936, 3204607199704] |