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A137933 as a simple table

na(n)
12
24
318
416
550
636
798
864
9162
10100
11242
12144
13338
14196
15450
16256
17578
18324
19722
20400
21882
22484
231058
24576
251250
26676
271458
28784
291682
30900
311922
321024
332178
341156
352450
361296
372738
381444
393042
401600
413362
421764
433698
441936
454050
462116
474418
482304
494802
502500
515202
522704

[2,4,18,16,50,36,98,64,162,100,242,144,338,196,
 450,256,578,324,722,400,882,484,1058,576,1250,676,
 1458,784,1682,900,1922,1024,2178,1156,2450,1296,
 2738,1444,3042,1600,3362,1764,3698,1936,4050,2116,
 4418,2304,4802,2500,5202,2704]