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A005304 as a simple table

na(n)
12
22
34
410
518
632
758
898
9164
10274
11442
12704
131114
141730
152660
164058
176114
189136
1913554
2019930

[2,2,4,10,18,32,58,98,164,274,442,704,1114,1730,
 2660,4058,6114,9136,13554,19930]