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A055305 as a simple table

na(n)
55
6450
718900
8588000
915876000
10400075200
119779616000
12237105792000
135779453680000
14142845262560000
153599700616512000
1692818726640640000
172454539660052480000
1866664716210892800000
191861170036255129600000

[5,450,18900,588000,15876000,400075200,9779616000,
 237105792000,5779453680000,142845262560000,
 3599700616512000,92818726640640000,
 2454539660052480000,66664716210892800000,
 1861170036255129600000]