n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 2 |
4 | 12 |
5 | 36 |
6 | 156 |
7 | 544 |
8 | 2144 |
9 | 7872 |
10 | 30096 |
11 | 112416 |
12 | 425536 |
13 | 1598528 |
14 | 6031296 |
15 | 22699008 |
16 | 85552128 |
17 | 322177024 |
18 | 1213849856 |
19 | 4572111360 |
20 | 17224104960 |
21 | 64880993280 |
22 | 244410981376 |
23 | 920685043712 |
24 | 3468237545472 |
25 | 13064787542016 |
[0,1,2,12,36,156,544,2144,7872,30096,112416, 425536,1598528,6031296,22699008,85552128, 322177024,1213849856,4572111360,17224104960, 64880993280,244410981376,920685043712, 3468237545472,13064787542016] |