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A187412 as a simple table

na(n)
12
24
36
48
510
612
715
816
919
1020
1123
1225
1327
1429
1531
1633
1736
1838
1939
2041
2144
2246
2348
2450
2552
2654
2757
2859
2961
3062
3165
3267
3369
3471
3573
3675
3777
3880
3982
4084
4186
4288
4390
4492
4594
4696
4798
48101
49103
50105
51107
52109
53111
54113
55115
56117
57119
58122
59124
60126
61128
62130
63132
64134
65136
66138
67140
68143
69145
70147
71149
72151

[2,4,6,8,10,12,15,16,19,20,23,25,27,29,31,33,36,
 38,39,41,44,46,48,50,52,54,57,59,61,62,65,67,69,
 71,73,75,77,80,82,84,86,88,90,92,94,96,98,101,103,
 105,107,109,111,113,115,117,119,122,124,126,128,
 130,132,134,136,138,140,143,145,147,149,151]