n | a(n) |
---|---|
2 | 1 |
3 | 8 |
4 | 41 |
5 | 272 |
6 | 1168 |
7 | 7428 |
8 | 30302 |
9 | 189808 |
10 | 759101 |
11 | 4724160 |
12 | 18728841 |
13 | 116207424 |
14 | 458829051 |
15 | 2842936320 |
16 | 11203933255 |
17 | 69378730880 |
18 | 273211969075 |
19 | 1691519468760 |
20 | 6660034471595 |
21 | 41235710124400 |
22 | 162381981186970 |
23 | 1005560117623204 |
24 | 3961069262796800 |
25 | 24534901740913872 |
[1,8,41,272,1168,7428,30302,189808,759101,4724160, 18728841,116207424,458829051,2842936320, 11203933255,69378730880,273211969075, 1691519468760,6660034471595,41235710124400, 162381981186970,1005560117623204,3961069262796800, 24534901740913872] |