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A333021 as a simple table

na(n)
12
24
36
416
518
640
742
852
954
1078
11100
12102
13104
14106
15126
16160
17162
18220
19222
20342
21378
22438
23460
24462
25498
26500
27502
28856
29858
30880
31882
321086
331276
341278
351300
361422
371480
381482
391566
401660
411662
421804
431806
441996
452058
462200
472202
482236
492238
503016
513018

[2,4,6,16,18,40,42,52,54,78,100,102,104,106,126,
 160,162,220,222,342,378,438,460,462,498,500,502,
 856,858,880,882,1086,1276,1278,1300,1422,1480,
 1482,1566,1660,1662,1804,1806,1996,2058,2200,2202,
 2236,2238,3016,3018]