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A171281 as a simple table

na(n)
17
249
3338
42318
516018
6109747
7749530
85133206
935065504
10239373097
111635980248
1211156399766
1376079006282
14519915363356

[7,49,338,2318,16018,109747,749530,5133206,
 35065504,239373097,1635980248,11156399766,
 76079006282,519915363356]