n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 9 |
6 | 20 |
7 | 48 |
8 | 115 |
9 | 286 |
10 | 719 |
11 | 1842 |
12 | 4766 |
13 | 12486 |
14 | 32972 |
15 | 87807 |
16 | 235365 |
17 | 634792 |
18 | 1720976 |
19 | 4688090 |
20 | 12824381 |
21 | 35216108 |
22 | 97037603 |
23 | 268229329 |
24 | 743562936 |
25 | 2066686470 |
26 | 5758171390 |
27 | 16079351152 |
[1,1,2,4,9,20,48,115,286,719,1842,4766,12486, 32972,87807,235365,634792,1720976,4688090, 12824381,35216108,97037603,268229329,743562936, 2066686470,5758171390,16079351152] |