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A228793 as a simple table

na(n)
15
242
3411
43957
537944
6362511
73459357
833001836
9314810115
103002974197
1128645256880
12273245752503
132606477735997
1424863061056388
15237167495775339
162262328872630837
1721580241878243944
18205852847074664031

[5,42,411,3957,37944,362511,3459357,33001836,
 314810115,3002974197,28645256880,273245752503,
 2606477735997,24863061056388,237167495775339,
 2262328872630837,21580241878243944,
 205852847074664031]