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A166500 as a simple table

na(n)
01
16
230
3150
4750
53750
618750
793750
8468750
92343750
1011718750
1158593750
12292968735
131464843600
147324217640
1536621086400
16183105423000
17915527070000
184577635125000
1922888174500000
20114440866875000
21572204306250000

[1,6,30,150,750,3750,18750,93750,468750,2343750,
 11718750,58593750,292968735,1464843600,7324217640,
 36621086400,183105423000,915527070000,
 4577635125000,22888174500000,114440866875000,
 572204306250000]