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A055746 as a simple table

na(n)
01
11
22
320
42800
516464000
612778698240000
74254956888736153600000
82026001446509988558521630720000000
94690285643617101997210180025102660272128000000000

[1,1,2,20,2800,16464000,12778698240000,
 4254956888736153600000,
 2026001446509988558521630720000000,
 4690285643617101997210180025102660272128000000000]