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A239412 as a simple table

na(n)
14
26
38
416
518
692
7254
8258
9660
101850
112496
122774
132832
147430
1528540
1632124

[4,6,8,16,18,92,254,258,660,1850,2496,2774,2832,
 7430,28540,32124]