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A212970 as a simple table

na(n)
00
12
28
322
444
580
6128
7196
8280
9390
10520
11682
12868
131092
141344
151640
161968
172346
182760
193230
203740
214312
224928
235612
246344
257150
268008
278946
289940
2911020
3012160
3113392
3214688
3316082
3417544
3519110
3620748
3722496
3824320
3926260
4028280

[0,2,8,22,44,80,128,196,280,390,520,682,868,1092,
 1344,1640,1968,2346,2760,3230,3740,4312,4928,5612,
 6344,7150,8008,8946,9940,11020,12160,13392,14688,
 16082,17544,19110,20748,22496,24320,26260,28280]