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A179712 as a simple table

na(n)
50
620
7700
812390
9172620
102112012
1123983344
12260353632
132749114368
1428553296200
15293791160520

[0,20,700,12390,172620,2112012,23983344,260353632,
 2749114368,28553296200,293791160520]