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A153939 as a simple table

na(n)
01
12
24
315
459
5432
63332
748304
8732710
920860338
10622243455
1134837075520
122043323102439
13224967044124824
1425947204334949263
155617471553259441802
161274053481965034919451
17542391484462533633238628

[1,2,4,15,59,432,3332,48304,732710,20860338,
 622243455,34837075520,2043323102439,
 224967044124824,25947204334949263,
 5617471553259441802,1274053481965034919451,
 542391484462533633238628]