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A373648 as a simple table

na(n)
12
24
312
432
536
660
772
884
9132
10140
11144
12156
13176
14192
15212
16216
17276
18312
19344
20392
21396
22420
23444
24456
25480
26500
27536
28540
29552
30560
31564
32612
33660
34672
35696
36704
37716
38732
39744
40756
41792
42816
43864
44876
45884
46912
47932
48956
49972
50996
511040
521092
531140
541152
551172
561200

[2,4,12,32,36,60,72,84,132,140,144,156,176,192,
 212,216,276,312,344,392,396,420,444,456,480,500,
 536,540,552,560,564,612,660,672,696,704,716,732,
 744,756,792,816,864,876,884,912,932,956,972,996,
 1040,1092,1140,1152,1172,1200]