n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 0 |
3 | 1 |
4 | 1 |
5 | 3 |
6 | 6 |
7 | 19 |
8 | 56 |
9 | 213 |
10 | 816 |
11 | 3717 |
12 | 17408 |
13 | 92935 |
14 | 513152 |
15 | 3147495 |
16 | 19993728 |
17 | 138638825 |
18 | 995169664 |
19 | 7700244745 |
20 | 61608152704 |
21 | 526317901451 |
22 | 4642742078336 |
23 | 43407723925499 |
24 | 418444180284544 |
25 | 4250149857500861 |
26 | 44444888840063360 |
[1,1,0,1,1,3,6,19,56,213,816,3717,17408,92935, 513152,3147495,19993728,138638825,995169664, 7700244745,61608152704,526317901451,4642742078336, 43407723925499,418444180284544,4250149857500861, 44444888840063360] |