n | a(n) |
---|---|
0 | 2 |
1 | 4 |
2 | 10 |
3 | 28 |
4 | 82 |
5 | 244 |
6 | 730 |
7 | 2188 |
8 | 6562 |
9 | 19684 |
10 | 59050 |
11 | 177148 |
12 | 531442 |
13 | 1594324 |
14 | 4782970 |
15 | 14348908 |
16 | 43046722 |
17 | 129140164 |
18 | 387420490 |
19 | 1162261468 |
20 | 3486784402 |
21 | 10460353204 |
22 | 31381059610 |
23 | 94143178828 |
24 | 282429536482 |
25 | 847288609444 |
26 | 2541865828330 |
27 | 7625597484988 |
[2,4,10,28,82,244,730,2188,6562,19684,59050, 177148,531442,1594324,4782970,14348908,43046722, 129140164,387420490,1162261468,3486784402, 10460353204,31381059610,94143178828,282429536482, 847288609444,2541865828330,7625597484988] |