n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 9 |
6 | 20 |
7 | 48 |
8 | 113 |
9 | 262 |
10 | 591 |
11 | 1263 |
12 | 2505 |
13 | 4764 |
14 | 8479 |
15 | 14285 |
16 | 22871 |
17 | 35316 |
18 | 52755 |
19 | 76517 |
20 | 107826 |
21 | 148914 |
22 | 202715 |
23 | 270622 |
[1,1,2,4,9,20,48,113,262,591,1263,2505,4764,8479, 14285,22871,35316,52755,76517,107826,148914, 202715,270622] |