n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 9 |
5 | 20 |
6 | 50 |
7 | 128 |
8 | 351 |
9 | 1009 |
10 | 3035 |
11 | 9464 |
12 | 30479 |
13 | 100712 |
14 | 340072 |
15 | 1169296 |
16 | 4082243 |
17 | 14438577 |
18 | 51643698 |
19 | 186530851 |
20 | 679530937 |
21 | 2494433346 |
22 | 9219028889 |
23 | 34280914106 |
24 | 128179985474 |
25 | 481694091291 |
26 | 1818516190252 |
27 | 6894350122452 |
[1,1,2,4,9,20,50,128,351,1009,3035,9464,30479, 100712,340072,1169296,4082243,14438577,51643698, 186530851,679530937,2494433346,9219028889, 34280914106,128179985474,481694091291, 1818516190252,6894350122452] |