n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 4 |
5 | 9 |
6 | 27 |
7 | 89 |
8 | 304 |
9 | 944 |
10 | 3259 |
11 | 11081 |
12 | 38044 |
13 | 132921 |
14 | 467771 |
15 | 1650279 |
16 | 5907280 |
17 | 21183657 |
18 | 76488912 |
19 | 277631065 |
20 | 1012588940 |
21 | 3707127319 |
22 | 13632296219 |
23 | 50292158921 |
24 | 186165033296 |
25 | 691181554768 |
26 | 2573423459611 |
[1,1,1,4,9,27,89,304,944,3259,11081,38044,132921, 467771,1650279,5907280,21183657,76488912, 277631065,1012588940,3707127319,13632296219, 50292158921,186165033296,691181554768, 2573423459611] |