n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 2 |
3 | 15 |
4 | 116 |
5 | 1030 |
6 | 10644 |
7 | 127428 |
8 | 1750944 |
9 | 27325296 |
10 | 479288160 |
11 | 9355658400 |
12 | 201405744000 |
13 | 4743245520000 |
14 | 121334466758400 |
15 | 3350276227872000 |
16 | 99309556729958400 |
17 | 3145135939426252800 |
[0,0,2,15,116,1030,10644,127428,1750944,27325296, 479288160,9355658400,201405744000,4743245520000, 121334466758400,3350276227872000, 99309556729958400,3145135939426252800] |