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A066538 as a simple table

na(n)
13
27
34
410
519
613
728
846
973
10112
11139
12154
13697
14847
151675
163106
173106
184258
195755
205950
2113216
2213693
2314980
2427202
2528939
2631339
2760337
28116455
29149365
30179488
31291745
321026544
331163443
341704376
351893388
364038358
374092673
389440671
3918243946
4028445131
4132580433
4235170384
4341201947
4444142151
4550349694
4657766339
4758416637

[3,7,4,10,19,13,28,46,73,112,139,154,697,847,1675,
 3106,3106,4258,5755,5950,13216,13693,14980,27202,
 28939,31339,60337,116455,149365,179488,291745,
 1026544,1163443,1704376,1893388,4038358,4092673,
 9440671,18243946,28445131,32580433,35170384,
 41201947,44142151,50349694,57766339,58416637]