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A187908 as a simple table

na(n)
12
24
36
48
510
612
714
817
918
1021
1122
1225
1327
1429
1531
1633
1735
1837
1939
2042
2144
2245
2347
2450
2552
2654
2756
2858
2960
3062
3165
3267
3369
3470
3572
3675
3777
3879
3981
4083
4185
4287
4390
4492
4594
4696
4798
48100
49102
50104
51106
52108
53110
54112
55115
56117
57119
58121
59123
60125
61127
62129
63131
64133
65135
66137
67140
68142
69144
70146
71148
72150
73152

[2,4,6,8,10,12,14,17,18,21,22,25,27,29,31,33,35,
 37,39,42,44,45,47,50,52,54,56,58,60,62,65,67,69,
 70,72,75,77,79,81,83,85,87,90,92,94,96,98,100,102,
 104,106,108,110,112,115,117,119,121,123,125,127,
 129,131,133,135,137,140,142,144,146,148,150,152]