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A175039 as a simple table

na(n)
11
23
33
47
56
67
77
811
912
1013
1112
1215
1314
1415
1515
1620
1720
1823
1922
2023
2124
2225
2324
2429
2528
2629
2728

[1,3,3,7,6,7,7,11,12,13,12,15,14,15,15,20,20,23,
 22,23,24,25,24,29,28,29,28]