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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 44 |
| 2 | 5448 |
| 3 | 1368000 |
| 4 | 582099840 |
| 5 | 376473484800 |
| 6 | 344363351270400 |
| 7 | 423339874346188800 |
| 8 | 673376579943395328000 |
| 9 | 1345784983980056395776000 |
| 10 | 3301392542765404011724800000 |
| 11 | 9753450102655318719886786560000 |
| 12 | 34158406495145697860977486725120000 |
| 13 | 139935446125707791138289350344704000000 |
[1,44,5448,1368000,582099840,376473484800, 344363351270400,423339874346188800, 673376579943395328000,1345784983980056395776000, 3301392542765404011724800000, 9753450102655318719886786560000, 34158406495145697860977486725120000, 139935446125707791138289350344704000000] |