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A317068 as a simple table

na(n)
12
298
31161
416910
5241716
63449720
749272887
8703694269
910049871762
10143528455050
112049818154527
1229274714197340
13418090207402991
145971003513309886
1585275575281695947
161217872962830483355

[2,98,1161,16910,241716,3449720,49272887,
 703694269,10049871762,143528455050,2049818154527,
 29274714197340,418090207402991,5971003513309886,
 85275575281695947,1217872962830483355]