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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 24 |
| 5 | 768 |
| 6 | 818688 |
| 7 | 918482792448 |
| 8 | 1160710851973467480711168 |
| 9 | 1851362556448808267346772937519541852218467221504 |
| 10 | 188473437767072793673508563952884052289202111379015123907036183743886914255400892747408659578880 |
[1,2,4,24,768,818688,918482792448, 1160710851973467480711168, 1851362556448808267346772937519541852218467221504, 18847343776707279367350856395288405228920211137901\ 5123907036183743886914255400892747408659578880] |