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A084488 as a simple table

na(n)
28
312
420
524
632
736
848
952
1060
1168
1280
1384
1496
15100
16112
17120
18128
19140
20144
21152
22168
23172
24192
25200
26204
27212
28216
29236
30240
31264
32268
33276
34288
35300
36308
37320
38336
39340
40352
41360
42372
43384
44392
45396
46428
47440
48452
49456
50468
51472
52480
53492
54508
55520
56532

[8,12,20,24,32,36,48,52,60,68,80,84,96,100,112,
 120,128,140,144,152,168,172,192,200,204,212,216,
 236,240,264,268,276,288,300,308,320,336,340,352,
 360,372,384,392,396,428,440,452,456,468,472,480,
 492,508,520,532]