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A164627 as a simple table

na(n)
01
116
2240
33600
454000
5810000
612150000
7182249880
82733746400
941006169120
10615092133600
119226375956000
12138395548620000
132075931868500000
1431138957615514280
15467084058053130000
167006256278106196720

[1,16,240,3600,54000,810000,12150000,182249880,
 2733746400,41006169120,615092133600,9226375956000,
 138395548620000,2075931868500000,
 31138957615514280,467084058053130000,
 7006256278106196720]