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A303640 as a simple table

na(n)
13
23
39
413
533
615
7121
884
9103
1026
11259
12295
13433
1471
15111
16331
17317
18366
19649
2080
21283
22274
23429
244542
253071
262138
274241
2874
29761
303083
31103
321847
331683
343886
351233
36470
372359
381182
391797
403431
412037
421767
437543
449106
451867
46656
475469
486012
4912245
502225

[3,3,9,13,33,15,121,84,103,26,259,295,433,71,111,
 331,317,366,649,80,283,274,429,4542,3071,2138,
 4241,74,761,3083,103,1847,1683,3886,1233,470,2359,
 1182,1797,3431,2037,1767,7543,9106,1867,656,5469,
 6012,12245,2225]