n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 8 |
3 | 60 |
4 | 320 |
5 | 1980 |
6 | 10512 |
7 | 60788 |
8 | 320896 |
9 | 1787904 |
10 | 9381840 |
11 | 51081844 |
12 | 266680992 |
13 | 1429703548 |
14 | 7432424160 |
15 | 39409195740 |
16 | 204150606976 |
17 | 1073644675448 |
18 | 5545305620064 |
[1,2,8,60,320,1980,10512,60788,320896,1787904, 9381840,51081844,266680992,1429703548,7432424160, 39409195740,204150606976,1073644675448, 5545305620064] |