The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 6 | 27216 |
| 7 | 453789 |
| 8 | 3866624 |
| 9 | 22674816 |
| 10 | 103500000 |
| 11 | 393286542 |
| 12 | 1297410048 |
| 13 | 3822832728 |
| 14 | 10267329072 |
| 15 | 25518796875 |
| 16 | 59378761728 |
| 17 | 130535973152 |
| 18 | 273106821312 |
| 19 | 547049504268 |
| 20 | 1054272000000 |
| 21 | 1962916959024 |
| 22 | 3543150344976 |
| 23 | 6218839661001 |
| 24 | 10640820731904 |
| 25 | 17789062500000 |
[27216,453789,3866624,22674816,103500000, 393286542,1297410048,3822832728,10267329072, 25518796875,59378761728,130535973152,273106821312, 547049504268,1054272000000,1962916959024, 3543150344976,6218839661001,10640820731904, 17789062500000] |