n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 8 |
4 | 18 |
5 | 78 |
6 | 206 |
7 | 872 |
8 | 2226 |
9 | 10820 |
10 | 26558 |
11 | 129248 |
12 | 335886 |
13 | 1630174 |
14 | 3990978 |
15 | 21778450 |
16 | 48749804 |
17 | 274937594 |
18 | 650637382 |
19 | 3598954596 |
20 | 7610277626 |
21 | 49741540498 |
22 | 93757794966 |
23 | 639655810986 |
24 | 1233712869392 |
25 | 8530089042832 |
[1,2,8,18,78,206,872,2226,10820,26558,129248, 335886,1630174,3990978,21778450,48749804, 274937594,650637382,3598954596,7610277626, 49741540498,93757794966,639655810986, 1233712869392,8530089042832] |