n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 12 |
4 | 72 |
5 | 480 |
6 | 3780 |
7 | 35280 |
8 | 372960 |
9 | 4263840 |
10 | 54432000 |
11 | 758419200 |
12 | 11436163200 |
13 | 185253868800 |
14 | 3214699488000 |
15 | 59172265152000 |
16 | 1163830187520000 |
17 | 24097823253504000 |
18 | 525794940582912000 |
19 | 12073276215576576000 |
20 | 290883846352619520000 |
21 | 7318777466097377280000 |
[1,1,3,12,72,480,3780,35280,372960,4263840, 54432000,758419200,11436163200,185253868800, 3214699488000,59172265152000,1163830187520000, 24097823253504000,525794940582912000, 12073276215576576000,290883846352619520000, 7318777466097377280000] |