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A278212 as a simple table

na(n)
10
22
38
420
538
664
7100
8144
9196
10256
11324
12400
13484
14576
15676
16784
17900
181024
191156
201296
211444
221600
231764
241936
252116
262304
272500
282704
292916
303136
313364
323600
333844
344096
354356
364624
374900
385184
395476
405776
416084
426400
436724
447056
457396
467744
478100
488464
498836
509216

[0,2,8,20,38,64,100,144,196,256,324,400,484,576,
 676,784,900,1024,1156,1296,1444,1600,1764,1936,
 2116,2304,2500,2704,2916,3136,3364,3600,3844,4096,
 4356,4624,4900,5184,5476,5776,6084,6400,6724,7056,
 7396,7744,8100,8464,8836,9216]