n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 9 |
5 | 23 |
6 | 64 |
7 | 187 |
8 | 566 |
9 | 1777 |
10 | 5820 |
11 | 19944 |
12 | 71343 |
13 | 264719 |
14 | 1011292 |
15 | 3953381 |
16 | 15756609 |
17 | 63945484 |
18 | 264384828 |
19 | 1115246518 |
20 | 4806957739 |
21 | 21189601861 |
22 | 95516470253 |
23 | 439777682222 |
24 | 2064164172616 |
25 | 9853934668051 |
26 | 47736608806520 |
27 | 234235866539512 |
28 | 1162618720397931 |
[1,1,2,4,9,23,64,187,566,1777,5820,19944,71343, 264719,1011292,3953381,15756609,63945484, 264384828,1115246518,4806957739,21189601861, 95516470253,439777682222,2064164172616, 9853934668051,47736608806520,234235866539512, 1162618720397931] |