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A256584 as a simple table

na(n)
16
212
354
496
5108
6126
7144
8180
9192
10216
11234
12240
13264
14270
15336
16360
17378
18408
19480
20486
21504
22522
23540
24594
25600
26744
27750
28756
29864
30900
31972
32990
331008
341026
351116
361134
371224
381296
391350
401386
411404
421494
431500
441536
451584
461620
471656
481728
491800
501872

[6,12,54,96,108,126,144,180,192,216,234,240,264,
 270,336,360,378,408,480,486,504,522,540,594,600,
 744,750,756,864,900,972,990,1008,1026,1116,1134,
 1224,1296,1350,1386,1404,1494,1500,1536,1584,1620,
 1656,1728,1800,1872]