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A067874 as a simple table

na(n)
12
24
36
412
514
616
718
820
922
1030
1132
1234
1336
1438
1540
1642
1752
1854
1956
2058
2160
2266
2368
2470
2572
2678
2784
2886
2988
3090
3192
3294
3396
34102
35104
36106
37108
38110
39112
40114
41128
42130
43132
44138
45140
46142
47144
48150
49156
50158
51160
52162
53164
54166
55178
56180
57182
58184
59186
60192
61194
62196
63198

[2,4,6,12,14,16,18,20,22,30,32,34,36,38,40,42,52,
 54,56,58,60,66,68,70,72,78,84,86,88,90,92,94,96,
 102,104,106,108,110,112,114,128,130,132,138,140,
 142,144,150,156,158,160,162,164,166,178,180,182,
 184,186,192,194,196,198]