n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 8 |
3 | 26 |
4 | 80 |
5 | 242 |
6 | 728 |
7 | 2186 |
8 | 6560 |
9 | 19682 |
10 | 59048 |
11 | 177146 |
12 | 531440 |
13 | 1594322 |
14 | 4782968 |
15 | 14348906 |
16 | 43046720 |
17 | 129140162 |
18 | 387420488 |
19 | 1162261466 |
20 | 3486784400 |
21 | 10460353202 |
22 | 31381059608 |
23 | 94143178826 |
24 | 282429536480 |
25 | 847288609442 |
26 | 2541865828328 |
27 | 7625597484986 |
28 | 22876792454960 |
[0,2,8,26,80,242,728,2186,6560,19682,59048,177146, 531440,1594322,4782968,14348906,43046720, 129140162,387420488,1162261466,3486784400, 10460353202,31381059608,94143178826,282429536480, 847288609442,2541865828328,7625597484986, 22876792454960] |