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A197926 as a simple table

na(n)
11
22
34
410
518
6142
7202
8282
9528
10812
111240
121280
131372
141454
151488
161666

[1,2,4,10,18,142,202,282,528,812,1240,1280,1372,
 1454,1488,1666]