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A037566 as a simple table

na(n)
12
220
3181
41631
514681
6132130
71189172
810702550
996322951
10866906561
117802159051
1270219431460
13631974883142
145687773948280
1551189965534521
16460709689810691
174146387208296221

[2,20,181,1631,14681,132130,1189172,10702550,
 96322951,866906561,7802159051,70219431460,
 631974883142,5687773948280,51189965534521,
 460709689810691,4146387208296221]