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A180206 as a simple table

na(n)
11
22
34
48
518
656
7206
8866
93662
1016304
1177448
12405594
132296514
1413989280
1589990314
16612195224

[1,2,4,8,18,56,206,866,3662,16304,77448,405594,
 2296514,13989280,89990314,612195224]