The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 2196 |
| 4 | 37004 |
| 5 | 2317631400 |
| 6 | 216893681800 |
| 7 | 2326335506123418128 |
| 8 | 1208982377794384163088 |
| 9 | 2220650888749669503773432361504 |
| 10 | 6408743336016148761893699822360672 |
| 11 | 2015895925780490675949731718780144934779733312 |
| 12 | 32307672245407537492814937397129549558917000333504 |
[1,2,6,2196,37004,2317631400,216893681800, 2326335506123418128,1208982377794384163088, 2220650888749669503773432361504, 6408743336016148761893699822360672, 2015895925780490675949731718780144934779733312, 32307672245407537492814937397129549558917000333504\ ] |