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A247951 as a simple table

na(n)
11
25
350
41050
527300
61365000
768250000
85801250000
9527913750000
1068628787500000
118372712075000000
121758269535750000000
13298905821077500000000
1474726455269375000000000
1519428878370037500000000000
166625247524182787500000000000

[1,5,50,1050,27300,1365000,68250000,5801250000,
 527913750000,68628787500000,8372712075000000,
 1758269535750000000,298905821077500000000,
 74726455269375000000000,
 19428878370037500000000000,
 6625247524182787500000000000]