n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 6 |
4 | 87 |
5 | 1980 |
6 | 66270 |
7 | 3050460 |
8 | 184716630 |
9 | 14231775600 |
10 | 1359481407480 |
11 | 157694893448400 |
12 | 21835679256606600 |
13 | 3557942554594428000 |
14 | 673941365091485290800 |
15 | 146851484638349504613600 |
[0,0,1,6,87,1980,66270,3050460,184716630, 14231775600,1359481407480,157694893448400, 21835679256606600,3557942554594428000, 673941365091485290800,146851484638349504613600] |