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A157670 as a simple table

na(n)
1258065
21530170
33865157
47263026
511723777
617247410
723833925
831483322
940195601
1049970762
1160808805
1272709730
1385673537
1499700226
15114789797
16130942250
17148157585
18166435802
19185776901
20206180882
21227647745
22250177490

[258065,1530170,3865157,7263026,11723777,17247410,
 23833925,31483322,40195601,49970762,60808805,
 72709730,85673537,99700226,114789797,130942250,
 148157585,166435802,185776901,206180882,227647745,
 250177490]