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A188759 as a simple table

na(n)
120
2400
34792
453024
5532168
65163989
748759352
8454436200
94196906454
1038563523452
11353149127960
123227401734383
1329455645703492
14268607915360488
152448108525665546
1622304314950595356
17203163892637966720

[20,400,4792,53024,532168,5163989,48759352,
 454436200,4196906454,38563523452,353149127960,
 3227401734383,29455645703492,268607915360488,
 2448108525665546,22304314950595356,
 203163892637966720]