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A206415 as a simple table

na(n)
15
26
37
410
512
615
716
818
919
1022
1123
1225
1327
1429
1530
1632
1734
1836
1938
2040
2142
2244
2346
2448
2549
2650
2752
2854
2955
3057
3158
3260
3361
3463
3564
3666
3767
3869
3971
4072
4174
4276

[5,6,7,10,12,15,16,18,19,22,23,25,27,29,30,32,34,
 36,38,40,42,44,46,48,49,50,52,54,55,57,58,60,61,
 63,64,66,67,69,71,72,74,76]