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A187842 as a simple table

na(n)
12
24
36
49
511
613
715
818
920
1022
1124
1227
1329
1432
1533
1636
1738
1840
1943
2045
2147
2249
2352
2454
2556
2658
2761
2863
2965
3067
3170
3272
3375
3476
3579
3681
3784
3886
3988
4090
4192
4294
4397
4499
45101
46104
47106
48108
49110
50113
51115
52118
53120
54122
55124
56127
57129
58131
59133
60136
61138
62140
63142
64144
65147
66149
67151
68153
69156
70158
71160
72162
73165
74167
75170

[2,4,6,9,11,13,15,18,20,22,24,27,29,32,33,36,38,
 40,43,45,47,49,52,54,56,58,61,63,65,67,70,72,75,
 76,79,81,84,86,88,90,92,94,97,99,101,104,106,108,
 110,113,115,118,120,122,124,127,129,131,133,136,
 138,140,142,144,147,149,151,153,156,158,160,162,
 165,167,170]