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A057265 as a simple table

na(n)
12
28
312
418
524
640
756
860
972
1080
1184
1288
1396
14104
15108
16128
17132
18136
19152
20156
21180
22184
23204
24228
25232
26240
27248
28252
29276
30288
31296
32328
33344
34348
35360
36372
37376
38384
39396
40424
41444
42448
43450
44468
45472
46480
47488
48492

[2,8,12,18,24,40,56,60,72,80,84,88,96,104,108,128,
 132,136,152,156,180,184,204,228,232,240,248,252,
 276,288,296,328,344,348,360,372,376,384,396,424,
 444,448,450,468,472,480,488,492]