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A211982 as a simple table

na(n)
12
26
310
420
528
652
770
8114
9160
10238
11322
12476
13630
14880
151178
161602
172096
182814
193640
204798
216174
227996
2310184
2413090
2516526
2620972
2726330
2833124
2941260
3051546
3163794
3279092
3397384
34119920
35146846
36179874
37219106
38266878
39323680
40392336
41473686

[2,6,10,20,28,52,70,114,160,238,322,476,630,880,
 1178,1602,2096,2814,3640,4798,6174,7996,10184,
 13090,16526,20972,26330,33124,41260,51546,63794,
 79092,97384,119920,146846,179874,219106,266878,
 323680,392336,473686]