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A028844 as a simple table

na(n)
11
26
371
41261
529906
6887751
731657851
81318279586
962783681421
103365947782611
11200610405843926
1213157941480889921
13941848076798467801
1473060842413607398806
156105266987293752470991
16546770299628690541571901

[1,6,71,1261,29906,887751,31657851,1318279586,
 62783681421,3365947782611,200610405843926,
 13157941480889921,941848076798467801,
 73060842413607398806,6105266987293752470991,
 546770299628690541571901]