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A280968 as a simple table

na(n)
18
212
318
424
530
636
748
860
972
1084
11102
12120
13132
14144
15174
16204
17210
18216
19246
20276
21288
22300
23330
24360
25372
26384
27390
28396
29426
30456
31468
32480
33510
34540
35552
36564
37594
38624
39660
40696
41768
42840
43852
44864
45894
46924
47984
481044
491092
501140

[8,12,18,24,30,36,48,60,72,84,102,120,132,144,174,
 204,210,216,246,276,288,300,330,360,372,384,390,
 396,426,456,468,480,510,540,552,564,594,624,660,
 696,768,840,852,864,894,924,984,1044,1092,1140]