n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 11 |
4 | 30 |
5 | 80 |
6 | 214 |
7 | 574 |
8 | 1548 |
9 | 4197 |
10 | 11440 |
11 | 31339 |
12 | 86252 |
13 | 238407 |
14 | 661584 |
15 | 1842585 |
16 | 5148960 |
17 | 14432643 |
18 | 40569804 |
19 | 114339777 |
20 | 323031750 |
21 | 914683602 |
22 | 2595411126 |
23 | 7378861196 |
24 | 21016701652 |
25 | 59962687675 |
26 | 171353419536 |
27 | 490407962229 |
[1,4,11,30,80,214,574,1548,4197,11440,31339,86252, 238407,661584,1842585,5148960,14432643,40569804, 114339777,323031750,914683602,2595411126, 7378861196,21016701652,59962687675,171353419536, 490407962229] |