n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 8 |
5 | 20 |
6 | 48 |
7 | 216 |
8 | 576 |
9 | 1392 |
10 | 7200 |
11 | 43200 |
12 | 184320 |
13 | 1065600 |
14 | 4314240 |
15 | 21611520 |
16 | 150958080 |
17 | 573834240 |
18 | 2293401600 |
19 | 32107622400 |
20 | 236017152000 |
21 | 2798762803200 |
22 | 22493915136000 |
23 | 189837914112000 |
24 | 1165284436377600 |
25 | 13260174468710400 |
26 | 148874616963072000 |
[1,1,2,4,8,20,48,216,576,1392,7200,43200,184320, 1065600,4314240,21611520,150958080,573834240, 2293401600,32107622400,236017152000,2798762803200, 22493915136000,189837914112000,1165284436377600, 13260174468710400,148874616963072000] |