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A146402 as a simple table

na(n)
11
21
31
41
51
61
71
81
91
101
111
121
137
147
1521
1621
1751
1851
19261
20261
211539
221539
2311759
2411759

[1,1,1,1,1,1,1,1,1,1,1,1,7,7,21,21,51,51,261,261,
 1539,1539,11759,11759]