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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 208 |
| 4 | 84544 |
| 5 | 225285376 |
| 6 | 3562673554432 |
| 7 | 313228604408713216 |
| 8 | 146151093077541238226944 |
| 9 | 349492125813998287750324092928 |
| 10 | 4168173726631464433483457866110337024 |
[1,4,208,84544,225285376,3562673554432, 313228604408713216,146151093077541238226944, 349492125813998287750324092928, 4168173726631464433483457866110337024] |