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A187688 as a simple table

na(n)
12
24
36
48
510
613
714
817
919
1021
1123
1225
1327
1430
1532
1633
1736
1838
1940
2042
2144
2247
2349
2451
2553
2655
2757
2859
2961
3064
3166
3268
3370
3472
3574
3676
3778
3881
3983
4085
4187
4289
4391
4493
4595
4698
47100
48102
49104
50106
51109
52110
53112
54115
55117
56119
57121
58123
59126
60128
61129
62132
63134
64136
65138
66140
67142
68144
69147
70149
71151
72153
73155
74157
75160
76162
77164
78166
79168
80170

[2,4,6,8,10,13,14,17,19,21,23,25,27,30,32,33,36,
 38,40,42,44,47,49,51,53,55,57,59,61,64,66,68,70,
 72,74,76,78,81,83,85,87,89,91,93,95,98,100,102,
 104,106,109,110,112,115,117,119,121,123,126,128,
 129,132,134,136,138,140,142,144,147,149,151,153,
 155,157,160,162,164,166,168,170]