The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 17 |
| 3 | 242 |
| 4 | 3382 |
| 5 | 48504 |
| 6 | 725592 |
| 7 | 11393808 |
| 8 | 188204400 |
| 9 | 3270729600 |
| 10 | 59753750400 |
| 11 | 1146140409600 |
| 12 | 23046980025600 |
| 13 | 485075533132800 |
| 14 | 10669304848204800 |
| 15 | 244861798361241600 |
| 16 | 5854837379724748800 |
[0,1,17,242,3382,48504,725592,11393808,188204400, 3270729600,59753750400,1146140409600, 23046980025600,485075533132800,10669304848204800, 244861798361241600,5854837379724748800] |