n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 2 |
4 | 8 |
5 | 36 |
6 | 168 |
7 | 944 |
8 | 5760 |
9 | 41104 |
10 | 310304 |
11 | 2650592 |
12 | 23894144 |
13 | 237023424 |
14 | 2481859968 |
15 | 28021573376 |
16 | 333725331456 |
17 | 4225816615168 |
18 | 56329065984512 |
19 | 790713657219584 |
20 | 11650274400684032 |
21 | 179579770991391744 |
[0,1,2,2,8,36,168,944,5760,41104,310304,2650592, 23894144,237023424,2481859968,28021573376, 333725331456,4225816615168,56329065984512, 790713657219584,11650274400684032, 179579770991391744] |