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A081321 as a simple table

na(n)
16
2300
347040
414968800
57991343360
66422134118400
77240779786240000
810899907851216384000
921115899915689779200000
1051167604130438090014720000
11151615591667542267763097600000
12539306547534817468755148800000000
132267795648217238975260881584128000000

[6,300,47040,14968800,7991343360,6422134118400,
 7240779786240000,10899907851216384000,
 21115899915689779200000,
 51167604130438090014720000,
 151615591667542267763097600000,
 539306547534817468755148800000000,
 2267795648217238975260881584128000000]