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A028749 as a simple table

na(n)
12
23
35
46
57
68
710
811
912
1014
1115
1217
1318
1419
1520
1621
1722
1823
1924
2026
2127
2229
2330
2431
2532
2633
2734
2835

[2,3,5,6,7,8,10,11,12,14,15,17,18,19,20,21,22,23,
 24,26,27,29,30,31,32,33,34,35]