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A028251 as a simple table

na(n)
13
26
39
412
515
618
722
825
928
1031
1135
1238
1341
1444
1548
1651
1754
1857
1961
2064
2167
2270
2373
2477
2580
2683
2786
2890
2993
3096
3199
32103
33106
34109
35112
36116
37119
38122
39125
40128
41132
42135
43138
44141
45145
46148
47151
48154
49158
50161
51164
52167
53171
54174
55177
56180
57184
58187
59190

[3,6,9,12,15,18,22,25,28,31,35,38,41,44,48,51,54,
 57,61,64,67,70,73,77,80,83,86,90,93,96,99,103,106,
 109,112,116,119,122,125,128,132,135,138,141,145,
 148,151,154,158,161,164,167,171,174,177,180,184,
 187,190]