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A047539 as a simple table

na(n)
12
24
37
410
512
615
718
820
923
1026
1128
1231
1334
1436
1539
1642
1744
1847
1950
2052
2155
2258
2360
2463
2566
2668
2771
2874
2976
3079
3182
3284
3387
3490
3592
3695
3798
38100
39103
40106
41108
42111
43114
44116
45119
46122
47124
48127
49130
50132
51135
52138
53140
54143
55146
56148
57151
58154
59156
60159

[2,4,7,10,12,15,18,20,23,26,28,31,34,36,39,42,44,
 47,50,52,55,58,60,63,66,68,71,74,76,79,82,84,87,
 90,92,95,98,100,103,106,108,111,114,116,119,122,
 124,127,130,132,135,138,140,143,146,148,151,154,
 156,159]