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A286280 as a simple table

na(n)
21
31
42
52
64
72
85
94
108
112
1211
134
148
1510
1615
174
1814
193
2022
2113
228
232
2434
2511
2613
2720
2826
294
3041

[1,1,2,2,4,2,5,4,8,2,11,4,8,10,15,4,14,3,22,13,8,
 2,34,11,13,20,26,4,41]