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A047836 as a simple table

na(n)
12
24
38
412
516
624
732
836
940
1048
1156
1260
1364
1472
1580
1684
1796
18108
19112
20120
21128
22132
23144
24160
25168
26176
27180
28192
29200
30208
31216
32224
33240
34252
35256
36264
37280
38288
39300
40312
41320
42324
43336
44352
45360
46384
47392
48396
49400
50408
51416
52420
53432
54440
55448

[2,4,8,12,16,24,32,36,40,48,56,60,64,72,80,84,96,
 108,112,120,128,132,144,160,168,176,180,192,200,
 208,216,224,240,252,256,264,280,288,300,312,320,
 324,336,352,360,384,392,396,400,408,416,420,432,
 440,448]