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A187233 as a simple table

na(n)
12
24
36
48
510
612
714
817
918
1021
1122
1225
1327
1429
1531
1633
1735
1837
1940
2042
2143
2245
2348
2450
2552
2654
2756
2858
2960
3063
3165
3267
3368
3471
3573
3675
3777
3879
3981
4083
4186
4288
4390
4492
4594
4696
4798
48100
49102
50104
51106
52109
53111
54113
55115
56117
57119
58121
59123
60125
61127
62129
63132
64134
65136
66138
67140
68142
69144
70146
71148
72150
73152
74155
75157
76159
77161
78163
79165
80167
81169
82171
83173
84175
85178
86180

[2,4,6,8,10,12,14,17,18,21,22,25,27,29,31,33,35,
 37,40,42,43,45,48,50,52,54,56,58,60,63,65,67,68,
 71,73,75,77,79,81,83,86,88,90,92,94,96,98,100,102,
 104,106,109,111,113,115,117,119,121,123,125,127,
 129,132,134,136,138,140,142,144,146,148,150,152,
 155,157,159,161,163,165,167,169,171,173,175,178,
 180]