n | a(n) |
---|---|
0 | 1 |
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 | 12485 |
14 | 32970 |
15 | 87802 |
16 | 235355 |
17 | 634771 |
18 | 1720940 |
19 | 4688041 |
20 | 12824394 |
21 | 35216524 |
22 | 97039824 |
23 | 268238379 |
24 | 743596131 |
25 | 2066801045 |
26 | 5758552717 |
27 | 16080588286 |
28 | 44997928902 |
29 | 126160000878 |
30 | 354349643101 |
31 | 996946927831 |
[1,1,1,2,4,9,20,48,115,286,719,1842,4766,12485, 32970,87802,235355,634771,1720940,4688041, 12824394,35216524,97039824,268238379,743596131, 2066801045,5758552717,16080588286,44997928902, 126160000878,354349643101,996946927831] |