n | a(n) |
---|---|
1 | 4 |
2 | 40 |
3 | 418 |
4 | 3760 |
5 | 31416 |
6 | 256736 |
7 | 2075520 |
8 | 16690688 |
9 | 133871616 |
10 | 1072357376 |
11 | 8584396800 |
12 | 68697325568 |
13 | 549667209216 |
14 | 4397692092416 |
15 | 35182954414080 |
16 | 281469306011648 |
17 | 2251777130889216 |
18 | 18014307778297856 |
19 | 144114825151119360 |
[4,40,418,3760,31416,256736,2075520,16690688, 133871616,1072357376,8584396800,68697325568, 549667209216,4397692092416,35182954414080, 281469306011648,2251777130889216, 18014307778297856,144114825151119360] |