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A187348 as a simple table

na(n)
12
24
36
48
511
612
715
817
919
1021
1124
1226
1327
1430
1533
1634
1736
1838
1941
2043
2145
2247
2349
2452
2554
2656
2758
2860
2962
3064
3167
3269
3371
3473
3576
3677
3780
3882
3984
4086
4188
4291
4392
4495
4597
4699
47101
48104
49105
50108
51110
52112
53114
54117
55119
56120
57123
58125
59127
60129
61132
62134
63136

[2,4,6,8,11,12,15,17,19,21,24,26,27,30,33,34,36,
 38,41,43,45,47,49,52,54,56,58,60,62,64,67,69,71,
 73,76,77,80,82,84,86,88,91,92,95,97,99,101,104,
 105,108,110,112,114,117,119,120,123,125,127,129,
 132,134,136]