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A289678 as a simple table

na(n)
11
21
33
46
515
642
7131
8442
91551
105723
1122171
1289156
13370199
141589240
157020127
1631906974

[1,1,3,6,15,42,131,442,1551,5723,22171,89156,
 370199,1589240,7020127,31906974]