n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 6 |
4 | 16 |
5 | 48 |
6 | 140 |
7 | 408 |
8 | 1224 |
9 | 3640 |
10 | 10824 |
11 | 32192 |
12 | 96576 |
13 | 288912 |
14 | 864288 |
15 | 2585584 |
16 | 7735104 |
17 | 23205312 |
18 | 69551552 |
19 | 208461504 |
20 | 624806688 |
21 | 1872691488 |
22 | 5612903296 |
23 | 16838709888 |
24 | 50500659456 |
25 | 151455567744 |
26 | 454227600128 |
27 | 1362265877376 |
[1,2,6,16,48,140,408,1224,3640,10824,32192,96576, 288912,864288,2585584,7735104,23205312,69551552, 208461504,624806688,1872691488,5612903296, 16838709888,50500659456,151455567744,454227600128, 1362265877376] |