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A066622 as a simple table

na(n)
12
2232
323532
42357532
52357117532
623571113117532
7235711131713117532
82357111317191713117532
923571113171923191713117532
10235711131719232923191713117532
112357111317192329312923191713117532

[2,232,23532,2357532,2357117532,23571113117532,
 235711131713117532,2357111317191713117532,
 23571113171923191713117532,
 235711131719232923191713117532,
 2357111317192329312923191713117532]