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A146744 as a simple table

na(n)
11
21
31
41
517
629
7123
8759
94287
1032985
11430679
124420973
1381497997
141458257461
1541635242773

[1,1,1,1,17,29,123,759,4287,32985,430679,4420973,
 81497997,1458257461,41635242773]