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A028748 as a simple table

na(n)
12
23
35
46
57
68
710
812
913
1017
1118
1219
1320
1422
1523
1624
1726
1827
1928
2031
2132
2233
2334

[2,3,5,6,7,8,10,12,13,17,18,19,20,22,23,24,26,27,
 28,31,32,33,34]