n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 6 |
4 | 16 |
5 | 52 |
6 | 208 |
7 | 800 |
8 | 3360 |
9 | 16224 |
10 | 78088 |
11 | 393408 |
12 | 2189872 |
13 | 12371616 |
14 | 71835000 |
15 | 448860480 |
16 | 2871278464 |
17 | 18727425440 |
18 | 129070035784 |
19 | 913845701344 |
[1,2,6,16,52,208,800,3360,16224,78088,393408, 2189872,12371616,71835000,448860480,2871278464, 18727425440,129070035784,913845701344] |