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A139718 as a simple table

na(n)
12
26
38
412
518
620
724
830
932
1036
1142
1248
1350
1454
1556
1660
1772
1880
1990
2096
2198
22108
23110
24120
25128
26132
27140
28144
29150
30156
31162
32168
33180
34182
35192
36200
37210
38216
39224
40240
41242
42252
43270
44272
45288
46294
47300
48306
49320
50324
51336
52338
53342
54350
55360
56378
57380

[2,6,8,12,18,20,24,30,32,36,42,48,50,54,56,60,72,
 80,90,96,98,108,110,120,128,132,140,144,150,156,
 162,168,180,182,192,200,210,216,224,240,242,252,
 270,272,288,294,300,306,320,324,336,338,342,350,
 360,378,380]