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A284802 as a simple table

na(n)
12
28
312
416
520
638
762
886
9110
10148
11168
12188
13208
14228
15272
16292
17312
18332
19352
20396
21416
22436
23456
24476
25520
26540
27560
28580
29600
30698
31818
32938
331058
341178
351322
361442
371562
381682
391802
401946
412066
422186
432306
442426
452570
462690
472810
482930
493050
503248
513348

[2,8,12,16,20,38,62,86,110,148,168,188,208,228,
 272,292,312,332,352,396,416,436,456,476,520,540,
 560,580,600,698,818,938,1058,1178,1322,1442,1562,
 1682,1802,1946,2066,2186,2306,2426,2570,2690,2810,
 2930,3050,3248,3348]