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A054322 as a simple table

na(n)
04
180
2896
37680
456320
5372736
62293760
713369344
874711040
9403701760
102122317824
1110905190400
1254962159616
13272461987840
141331439861760
156425271074816
1630666066493440
17144929376436224
18678948430151680

[4,80,896,7680,56320,372736,2293760,13369344,
 74711040,403701760,2122317824,10905190400,
 54962159616,272461987840,1331439861760,
 6425271074816,30666066493440,144929376436224,
 678948430151680]