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A171645 as a simple table

na(n)
12
24
38
412
518
630
750
870
998
10154
11242
12286
13338
14442
15578
16646
17722
18874
191058
201334
211682
221798
231922
242294
252738

[2,4,8,12,18,30,50,70,98,154,242,286,338,442,578,
 646,722,874,1058,1334,1682,1798,1922,2294,2738]