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A138939 as a simple table

na(n)
16
212
318
420
530
636
754
866
9118
10138
11152
12182
13232
14264
15336
16340
17380
18414
19446
20492
21540
22624
23720
24762
251066
261094
271098
281170
291230
301254
311320
321428
331546
342018
352574
362724
372804
382920
393074
403316
413646
424124
434132
444186
454620
464802

[6,12,18,20,30,36,54,66,118,138,152,182,232,264,
 336,340,380,414,446,492,540,624,720,762,1066,1094,
 1098,1170,1230,1254,1320,1428,1546,2018,2574,2724,
 2804,2920,3074,3316,3646,4124,4132,4186,4620,4802]