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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 72 |
| 4 | 4760 |
| 5 | 1196800 |
| 6 | 1185344160 |
| 7 | 4704904407424 |
| 8 | 75251548566631296 |
| 9 | 4850542035077717613312 |
| 10 | 1257976093502471658023554560 |
| 11 | 1310350352604009611135942297681920 |
[1,4,72,4760,1196800,1185344160,4704904407424, 75251548566631296,4850542035077717613312, 1257976093502471658023554560, 1310350352604009611135942297681920] |