n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 4 |
4 | 8 |
5 | 20 |
6 | 44 |
7 | 114 |
8 | 312 |
9 | 894 |
10 | 2639 |
11 | 8005 |
12 | 24362 |
13 | 74918 |
14 | 231123 |
15 | 722388 |
16 | 2276599 |
17 | 7242497 |
18 | 23144119 |
19 | 74203799 |
20 | 238684352 |
[1,2,4,8,20,44,114,312,894,2639,8005,24362,74918, 231123,722388,2276599,7242497,23144119,74203799, 238684352] |