n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 60 |
7 | 1080 |
8 | 11970 |
9 | 105840 |
10 | 821952 |
11 | 5874480 |
12 | 39713550 |
13 | 258136200 |
14 | 1631273220 |
15 | 10096734312 |
16 | 61536377700 |
17 | 370710950400 |
18 | 2213749658880 |
19 | 13132080672480 |
20 | 77509456944318 |
21 | 455754569692680 |
[0,0,0,0,0,60,1080,11970,105840,821952,5874480, 39713550,258136200,1631273220,10096734312, 61536377700,370710950400,2213749658880, 13132080672480,77509456944318,455754569692680] |