n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 12 |
3 | 45 |
4 | 180 |
5 | 702 |
6 | 2808 |
7 | 11097 |
8 | 44388 |
9 | 176418 |
10 | 705672 |
11 | 2812482 |
12 | 11249928 |
13 | 44903484 |
14 | 179613936 |
15 | 717517521 |
16 | 2870070084 |
17 | 11470898106 |
18 | 45883592424 |
19 | 183438670950 |
20 | 733754683800 |
21 | 2934026948196 |
22 | 11736107792784 |
23 | 46934017407594 |
24 | 187736069630376 |
25 | 750833732416212 |
26 | 3003334929664848 |
[1,3,12,45,180,702,2808,11097,44388,176418,705672, 2812482,11249928,44903484,179613936,717517521, 2870070084,11470898106,45883592424,183438670950, 733754683800,2934026948196,11736107792784, 46934017407594,187736069630376,750833732416212, 3003334929664848] |