n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 8 |
4 | 40 |
5 | 256 |
6 | 1952 |
7 | 17408 |
8 | 177280 |
9 | 2031616 |
10 | 25866752 |
11 | 362283008 |
12 | 5535262720 |
13 | 91620376576 |
14 | 1633165156352 |
15 | 31191159799808 |
16 | 635421069967360 |
17 | 13753735117275136 |
18 | 315212388819402752 |
19 | 7625476699018231808 |
[1,1,2,8,40,256,1952,17408,177280,2031616, 25866752,362283008,5535262720,91620376576, 1633165156352,31191159799808,635421069967360, 13753735117275136,315212388819402752, 7625476699018231808] |