n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 40 |
3 | 160 |
4 | 5600 |
5 | 896 |
6 | 19200 |
7 | 76800 |
8 | 14784000 |
9 | 19712000 |
10 | 512512000 |
11 | 186368000 |
12 | 19568640000 |
13 | 6021120000 |
14 | 20889600000 |
15 | 7798784000 |
16 | 71310131200000 |
17 | 16778854400000 |
18 | 503365632000000 |
19 | 15138816000000 |
20 | 221798793216000000 |
21 | 6035341312000000 |
[1,4,40,160,5600,896,19200,76800,14784000, 19712000,512512000,186368000,19568640000, 6021120000,20889600000,7798784000,71310131200000, 16778854400000,503365632000000,15138816000000, 221798793216000000,6035341312000000] |