n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 28 |
3 | 132 |
4 | 616 |
5 | 2576 |
6 | 10456 |
7 | 41792 |
8 | 166928 |
9 | 665688 |
10 | 2654168 |
11 | 10593728 |
12 | 42306328 |
13 | 169162608 |
14 | 676625416 |
15 | 2707754136 |
[1,4,28,132,616,2576,10456,41792,166928,665688, 2654168,10593728,42306328,169162608,676625416, 2707754136] |