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A340690 as a simple table

na(n)
12
28
312
416
532
648
764
872
980
1096
11112
12120
13128
14144
15160
16168
17192
18200
19224
20240
21256
22280
23288
24320
25336
26384
27392
28432
29448
30480
31512
32576
33640
34672
35704
36720
37768
38800
39832
40864
41896
42960
431008
441024
451056
461120
471152
481200
491248
501280
511296
521344

[2,8,12,16,32,48,64,72,80,96,112,120,128,144,160,
 168,192,200,224,240,256,280,288,320,336,384,392,
 432,448,480,512,576,640,672,704,720,768,800,832,
 864,896,960,1008,1024,1056,1120,1152,1200,1248,
 1280,1296,1344]