n | a(n) |
---|---|
0 | 0 |
1 | 4 |
2 | 8 |
3 | 28 |
4 | 80 |
5 | 244 |
6 | 728 |
7 | 2188 |
8 | 6560 |
9 | 19684 |
10 | 59048 |
11 | 177148 |
12 | 531440 |
13 | 1594324 |
14 | 4782968 |
15 | 14348908 |
16 | 43046720 |
17 | 129140164 |
18 | 387420488 |
19 | 1162261468 |
20 | 3486784400 |
21 | 10460353204 |
22 | 31381059608 |
23 | 94143178828 |
24 | 282429536480 |
25 | 847288609444 |
26 | 2541865828328 |
27 | 7625597484988 |
[0,4,8,28,80,244,728,2188,6560,19684,59048,177148, 531440,1594324,4782968,14348908,43046720, 129140164,387420488,1162261468,3486784400, 10460353204,31381059608,94143178828,282429536480, 847288609444,2541865828328,7625597484988] |