n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 6 |
5 | 72 |
6 | 1920 |
7 | 69120 |
8 | 3402000 |
9 | 218252160 |
10 | 17708544000 |
11 | 1773002649600 |
12 | 214725759494400 |
13 | 30941575378560000 |
14 | 5231894853375590400 |
15 | 1025881591718766182400 |
16 | 230901375630648602880000 |
17 | 59127083048250564931584000 |
18 | 17091634972762948947148800000 |
[0,0,0,6,72,1920,69120,3402000,218252160, 17708544000,1773002649600,214725759494400, 30941575378560000,5231894853375590400, 1025881591718766182400,230901375630648602880000, 59127083048250564931584000, 17091634972762948947148800000] |