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A146705 as a simple table

na(n)
11
21
31
41
51
621
747
8269
91463
108149
1163091
12761263
138894963
14159626291
153010312887
1680637272407

[1,1,1,1,1,21,47,269,1463,8149,63091,761263,
 8894963,159626291,3010312887,80637272407]