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A166584 as a simple table

na(n)
01
116
2240
33600
454000
5810000
612150000
7182250000
82733750000
941006250000
10615093750000
119226406250000
12138396093749880
132075941406246400
1431139121093669120
15467086816404633600
167006302246063456000

[1,16,240,3600,54000,810000,12150000,182250000,
 2733750000,41006250000,615093750000,9226406250000,
 138396093749880,2075941406246400,
 31139121093669120,467086816404633600,
 7006302246063456000]