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A243882 as a simple table

na(n)
51
621
7124
8636
92749
1011265
1144028
12168673
13636526
142385703
158903294
1633177968
17123602040
18460821006
191720240295
206432225711
2124095079682
2290435264009
23340097165156
241281506663877
254838093967400
2618299480354681
2769340086808691
28263195643048634

[1,21,124,636,2749,11265,44028,168673,636526,
 2385703,8903294,33177968,123602040,460821006,
 1720240295,6432225711,24095079682,90435264009,
 340097165156,1281506663877,4838093967400,
 18299480354681,69340086808691,263195643048634]