n | a(n) |
---|---|
0 | 1 |
1 | 5 |
2 | 20 |
3 | 120 |
4 | 600 |
5 | 3120 |
6 | 15480 |
7 | 78120 |
8 | 390000 |
9 | 1953000 |
10 | 9762480 |
11 | 48828120 |
12 | 244124400 |
13 | 1220703120 |
14 | 6103437480 |
15 | 30517574880 |
16 | 152587500000 |
17 | 762939453120 |
18 | 3814695297000 |
19 | 19073486328120 |
20 | 95367421874400 |
21 | 476837158124880 |
22 | 2384185742187480 |
23 | 11920928955078120 |
[1,5,20,120,600,3120,15480,78120,390000,1953000, 9762480,48828120,244124400,1220703120,6103437480, 30517574880,152587500000,762939453120, 3814695297000,19073486328120,95367421874400, 476837158124880,2384185742187480, 11920928955078120] |