n | a(n) |
---|---|
0 | 1 |
1 | 12 |
2 | 54 |
3 | 250 |
4 | 1168 |
5 | 5486 |
6 | 25848 |
7 | 122024 |
8 | 576748 |
9 | 2728038 |
10 | 12909648 |
11 | 61108496 |
12 | 289310874 |
13 | 1369855464 |
14 | 6486547342 |
15 | 30716393200 |
16 | 145458062754 |
17 | 688830120102 |
18 | 3262050022332 |
19 | 15447978818780 |
20 | 73156731187376 |
21 | 346447866034700 |
[1,12,54,250,1168,5486,25848,122024,576748, 2728038,12909648,61108496,289310874,1369855464, 6486547342,30716393200,145458062754,688830120102, 3262050022332,15447978818780,73156731187376, 346447866034700] |