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A204820 as a simple table

na(n)
18
2-192
3161280
4-638668800
56974263296000
6-162193467211776000
76893871130369327104000
8-483949753351926762700800000
952208499391605859160162304000000
10-8200911084433448356878294712320000000

[8,-192,161280,-638668800,6974263296000,
 -162193467211776000,6893871130369327104000,
 -483949753351926762700800000,
 52208499391605859160162304000000,
 -8200911084433448356878294712320000000]