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A117074 as a simple table

na(n)
11
24
39
420
540
682
7166
8334
9670
101340
112682
125366
1310734
1421470
1542942
1685886
17171774

[1,4,9,20,40,82,166,334,670,1340,2682,5366,10734,
 21470,42942,85886,171774]