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A291876 as a simple table

na(n)
12
26
312
420
532
648
766
890
9122
10158
11206
12260
13324
14396
15492
16600
17728
18872
191034
201226
211442
221698
231986
242310
252694
263126
273612
284124
294700
305348
316116
326980
337952
348976
3510128
3611424
3712882
3814418
3916146
4018090
4120138
4222442
4325034
4427950
4531022
4634478
4738366

[2,6,12,20,32,48,66,90,122,158,206,260,324,396,
 492,600,728,872,1034,1226,1442,1698,1986,2310,
 2694,3126,3612,4124,4700,5348,6116,6980,7952,8976,
 10128,11424,12882,14418,16146,18090,20138,22442,
 25034,27950,31022,34478,38366]