n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 16 |
3 | 96 |
4 | 640 |
5 | 5280 |
6 | 27648 |
7 | 340704 |
8 | 1966080 |
9 | 15676416 |
10 | 124608000 |
11 | 1341648000 |
12 | 7166361600 |
13 | 97763702400 |
14 | 629315721216 |
15 | 4680529920000 |
16 | 42316647628800 |
17 | 483414202656000 |
18 | 2396062681399296 |
19 | 35513562609100800 |
20 | 211942058803200000 |
21 | 2006922093666287616 |
22 | 16837843397760000000 |
[1,4,16,96,640,5280,27648,340704,1966080,15676416, 124608000,1341648000,7166361600,97763702400, 629315721216,4680529920000,42316647628800, 483414202656000,2396062681399296, 35513562609100800,211942058803200000, 2006922093666287616,16837843397760000000] |