n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 6 |
3 | 16 |
4 | 56 |
5 | 176 |
6 | 576 |
7 | 1856 |
8 | 6016 |
9 | 19456 |
10 | 62976 |
11 | 203776 |
12 | 659456 |
13 | 2134016 |
14 | 6905856 |
15 | 22347776 |
16 | 72318976 |
17 | 234029056 |
18 | 757334016 |
19 | 2450784256 |
20 | 7930904576 |
21 | 25664946176 |
22 | 83053510656 |
23 | 268766806016 |
24 | 869747654656 |
25 | 2814562533376 |
26 | 9108115685376 |
27 | 29474481504256 |
[1,1,6,16,56,176,576,1856,6016,19456,62976,203776, 659456,2134016,6905856,22347776,72318976, 234029056,757334016,2450784256,7930904576, 25664946176,83053510656,268766806016,869747654656, 2814562533376,9108115685376,29474481504256] |