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A217381 as a simple table

na(n)
12
26
310
426
542
658
768
8196
9266
10602
111170
121288
131290
142990
154110
166292
177446
1836928
1957490
2065478
2178570
22188832

[2,6,10,26,42,58,68,196,266,602,1170,1288,1290,
 2990,4110,6292,7446,36928,57490,65478,78570,
 188832]