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A117075 as a simple table

na(n)
13
26
311
422
542
684
7168
8336
9672
101342
112684
125368
1310736
1421472
1542944
1685888
17171776

[3,6,11,22,42,84,168,336,672,1342,2684,5368,10736,
 21472,42944,85888,171776]