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A055351 as a simple table

na(n)
530
61500
747250
81234800
929635200
10685843200
1115717240000
12362244960000
138476532064000
14202580554176000
154963223577312000
16124948285862400000
173236755595673600000
1886346680044584960000
192372991796225290240000

[30,1500,47250,1234800,29635200,685843200,
 15717240000,362244960000,8476532064000,
 202580554176000,4963223577312000,
 124948285862400000,3236755595673600000,
 86346680044584960000,2372991796225290240000]