n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 8 |
3 | 50 |
4 | 288 |
5 | 1682 |
6 | 9800 |
7 | 57122 |
8 | 332928 |
9 | 1940450 |
10 | 11309768 |
11 | 65918162 |
12 | 384199200 |
13 | 2239277042 |
14 | 13051463048 |
15 | 76069501250 |
16 | 443365544448 |
17 | 2584123765442 |
18 | 15061377048200 |
19 | 87784138523762 |
20 | 511643454094368 |
[0,2,8,50,288,1682,9800,57122,332928,1940450, 11309768,65918162,384199200,2239277042, 13051463048,76069501250,443365544448, 2584123765442,15061377048200,87784138523762, 511643454094368] |