n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 9 |
6 | 20 |
7 | 48 |
8 | 115 |
9 | 286 |
10 | 718 |
11 | 1838 |
12 | 4750 |
13 | 12431 |
14 | 32790 |
15 | 87225 |
16 | 233534 |
17 | 629123 |
18 | 1703586 |
19 | 4635181 |
20 | 12664335 |
21 | 34734322 |
22 | 95592704 |
23 | 263909594 |
[1,1,2,4,9,20,48,115,286,718,1838,4750,12431, 32790,87225,233534,629123,1703586,4635181, 12664335,34734322,95592704,263909594] |