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A187473 as a simple table

na(n)
12
24
36
48
510
612
715
816
919
1021
1123
1225
1327
1429
1531
1634
1736
1837
1939
2042
2144
2246
2348
2450
2552
2655
2757
2859
2961
3063
3165
3267
3369
3471
3573
3676
3778
3880
3982
4084
4186
4288
4390
4492
4595
4697
4799
48101
49103
50105
51107
52109
53111
54113
55116
56118
57120
58122
59124
60126
61128
62130
63132
64135

[2,4,6,8,10,12,15,16,19,21,23,25,27,29,31,34,36,
 37,39,42,44,46,48,50,52,55,57,59,61,63,65,67,69,
 71,73,76,78,80,82,84,86,88,90,92,95,97,99,101,103,
 105,107,109,111,113,116,118,120,122,124,126,128,
 130,132,135]