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A304349 as a simple table

na(n)
12
25
39
421
557
6125
7289
8741
91737
104045
119969
1223861
1356217
14135965
15326849
16776581
171864297
184479085
1910691729
2025606101
2161438777
22146972605
23351821409
24843331621
252019112457
264833683725
2711580336689
2827733236341
2966402706137

[2,5,9,21,57,125,289,741,1737,4045,9969,23861,
 56217,135965,326849,776581,1864297,4479085,
 10691729,25606101,61438777,146972605,351821409,
 843331621,2019112457,4833683725,11580336689,
 27733236341,66402706137]