n | a(n) |
---|---|
0 | 2 |
1 | 6 |
2 | 16 |
3 | 42 |
4 | 110 |
5 | 288 |
6 | 754 |
7 | 1974 |
8 | 5168 |
9 | 13530 |
10 | 35422 |
11 | 92736 |
12 | 242786 |
13 | 635622 |
14 | 1664080 |
15 | 4356618 |
16 | 11405774 |
17 | 29860704 |
18 | 78176338 |
19 | 204668310 |
20 | 535828592 |
21 | 1402817466 |
22 | 3672623806 |
23 | 9615053952 |
24 | 25172538050 |
25 | 65902560198 |
26 | 172535142544 |
[2,6,16,42,110,288,754,1974,5168,13530,35422, 92736,242786,635622,1664080,4356618,11405774, 29860704,78176338,204668310,535828592,1402817466, 3672623806,9615053952,25172538050,65902560198, 172535142544] |