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A181372 as a simple table

na(n)
21
33
46
56
627
724
810
972
10162
1180
1215
13150
14576
15810
16240
1721
18270
191500
203840
213645
22672
2328
24441
253240
2612500
2723040
2815309
291792
3036
31672
326174
3332400
3493750
35129024
3661236
374608
3845
39972
4010752
4172030
42291600
43656250
44688128
45236196
4611520

[1,3,6,6,27,24,10,72,162,80,15,150,576,810,240,21,
 270,1500,3840,3645,672,28,441,3240,12500,23040,
 15309,1792,36,672,6174,32400,93750,129024,61236,
 4608,45,972,10752,72030,291600,656250,688128,
 236196,11520]