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A162509 as a simple table

na(n)
01
11
24
320
4124
5932
68284
785220
8997084
913082852
10190320604
113040770020
1252937870044
13997533561572
1420228969244124
15439283696014820
1610170742982007004
17250110224694309092
186510327792455418844
19178832105312143131620
205169772417850111583964

[1,1,4,20,124,932,8284,85220,997084,13082852,
 190320604,3040770020,52937870044,997533561572,
 20228969244124,439283696014820,10170742982007004,
 250110224694309092,6510327792455418844,
 178832105312143131620,5169772417850111583964]