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A028755 as a simple table

na(n)
12
23
35
46
58
610
711
812
913
1014
1117
1219
1320
1423
1524
1626
1727
1829
1931
2032
2133
2234
2335
2438
2540
2641

[2,3,5,6,8,10,11,12,13,14,17,19,20,23,24,26,27,29,
 31,32,33,34,35,38,40,41]