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A062118 as a simple table

na(n)
11
250
360
4250
53792
67600
7376000
8495475
9625000
10971582
1166952741
1293760000
13177656344
143199268655
159062500000
1610937600000
17788138178328
18860628177919
19890625000000
202291665833333
212780225311054
222890625000000
2371093760000000
24128906250000000

[1,50,60,250,3792,7600,376000,495475,625000,
 971582,66952741,93760000,177656344,3199268655,
 9062500000,10937600000,788138178328,860628177919,
 890625000000,2291665833333,2780225311054,
 2890625000000,71093760000000,128906250000000]