n | a(n) |
---|---|
1 | 2 |
2 | 1 |
3 | 4 |
4 | 8 |
5 | 24 |
6 | 56 |
7 | 156 |
8 | 400 |
9 | 1092 |
10 | 2928 |
11 | 8052 |
12 | 22080 |
13 | 61320 |
14 | 170664 |
15 | 478288 |
16 | 1344800 |
17 | 3798240 |
18 | 10760568 |
19 | 30585828 |
20 | 87166656 |
21 | 249055976 |
22 | 713197848 |
23 | 2046590844 |
24 | 5883926400 |
25 | 16945772184 |
26 | 48881973840 |
27 | 141214767876 |
28 | 408513980160 |
29 | 1183282368360 |
30 | 3431518388960 |
[2,1,4,8,24,56,156,400,1092,2928,8052,22080,61320, 170664,478288,1344800,3798240,10760568,30585828, 87166656,249055976,713197848,2046590844, 5883926400,16945772184,48881973840,141214767876, 408513980160,1183282368360,3431518388960] |