The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8520192 |
| 3 | 956147263254051187507200 |
| 4 | 790929096572487518050439299107158612099228070051840000 |
| 5 | 266108022587896795750359251172229660295854509829286134803404773931312693787460334360985600000000000 |
[1,2,8520192,956147263254051187507200, 79092909657248751805043929910715861209922807005184\ 0000, 26610802258789679575035925117222966029585450982928\ 6134803404773931312693787460334360985600000000000] |