n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 40 |
3 | 688 |
4 | 17152 |
5 | 564864 |
6 | 23212288 |
7 | 1145627648 |
8 | 66082594816 |
9 | 4365282304000 |
10 | 325074868781056 |
11 | 26950224851927040 |
12 | 2462208223872286720 |
13 | 245811899064585814016 |
14 | 26626175172644096180224 |
15 | 3110339882223194198769664 |
16 | 389786352057654976473726976 |
[1,4,40,688,17152,564864,23212288,1145627648, 66082594816,4365282304000,325074868781056, 26950224851927040,2462208223872286720, 245811899064585814016,26626175172644096180224, 3110339882223194198769664, 389786352057654976473726976] |