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A190521 as a simple table

na(n)
12
24
37
410
512
615
718
820
923
1028
1130
1233
1336
1438
1541
1643
1746
1849
1952
2057
2160
2262
2365
2468
2570
2673
2776
2878
2981
3086
3188
3290
3394
3496
3598
36102
37104
38107
39112
40115
41118
42120
43123
44126
45128
46131
47134
48137
49140
50144
51146
52149
53152
54154
55156
56160
57163
58165
59170
60173
61175
62179
63181
64183
65187
66189
67192
68196
69198
70201
71204
72207
73209
74212
75215

[2,4,7,10,12,15,18,20,23,28,30,33,36,38,41,43,46,
 49,52,57,60,62,65,68,70,73,76,78,81,86,88,90,94,
 96,98,102,104,107,112,115,118,120,123,126,128,131,
 134,137,140,144,146,149,152,154,156,160,163,165,
 170,173,175,179,181,183,187,189,192,196,198,201,
 204,207,209,212,215]